diff --git a/packages/glob/__tests__/glob.test.ts b/packages/glob/__tests__/internal-globber.test.ts
similarity index 69%
rename from packages/glob/__tests__/glob.test.ts
rename to packages/glob/__tests__/internal-globber.test.ts
index 810117ae..feba4433 100644
--- a/packages/glob/__tests__/glob.test.ts
+++ b/packages/glob/__tests__/internal-globber.test.ts
@@ -1,36 +1,143 @@
 import * as child from 'child_process'
-import * as glob from '../src/glob'
 import * as io from '../../io/src/io'
+import * as os from 'os'
 import * as path from 'path'
+import {Globber, DefaultGlobber} from '../src/internal-globber'
+import {GlobOptions} from '../src/internal-glob-options'
 import {promises as fs} from 'fs'
 
 const IS_WINDOWS = process.platform === 'win32'
 
 /**
- * These test focus on the ability of glob to find files
+ * These test focus on the ability of globber to find files
  * and not on the pattern matching aspect
  */
-describe('glob', () => {
+describe('globber', () => {
   beforeAll(async () => {
     await io.rmRF(getTestTemp())
   })
 
-  it('detects cycle', async () => {
+  it('captures cwd', async () => {
+    // Create the following layout:
+    //   first-cwd
+    //   first-cwd/the-correct-file
+    //   second-cwd
+    //   second-cwd/the-wrong-file
+    const root = path.join(getTestTemp(), 'preserves-cwd')
+    await fs.mkdir(path.join(root, 'first-cwd'), {recursive: true})
+    await fs.writeFile(
+      path.join(root, 'first-cwd', 'the-correct-file.txt'),
+      'test file content'
+    )
+    await fs.mkdir(path.join(root, 'second-cwd'), {recursive: true})
+    await fs.writeFile(
+      path.join(root, 'second-cwd', 'the-wrong-file.txt'),
+      'test file content'
+    )
+
+    const originalCwd = process.cwd()
+    try {
+      process.chdir(path.join(root, 'first-cwd'))
+      const globber = await DefaultGlobber.create('*')
+      process.chdir(path.join(root, 'second-cwd'))
+      expect(globber.getSearchPaths()).toEqual([path.join(root, 'first-cwd')])
+      const itemPaths = await globber.glob()
+      expect(itemPaths).toEqual([
+        path.join(root, 'first-cwd', 'the-correct-file.txt')
+      ])
+    } finally {
+      process.chdir(originalCwd)
+    }
+  })
+
+  it('defaults to followSymbolicLinks=true', async () => {
+    // Create the following layout:
+    //   <root>
+    //   <root>/folder-a
+    //   <root>/folder-a/file
+    //   <root>/symDir -> <root>/folder-a
+    const root = path.join(
+      getTestTemp(),
+      'defaults-to-follow-symbolic-links-true'
+    )
+    await fs.mkdir(path.join(root, 'folder-a'), {recursive: true})
+    await fs.writeFile(path.join(root, 'folder-a', 'file'), 'test file content')
+    await createSymlinkDir(
+      path.join(root, 'folder-a'),
+      path.join(root, 'symDir')
+    )
+
+    const itemPaths = await glob(root, {})
+    expect(itemPaths).toEqual([
+      root,
+      path.join(root, 'folder-a'),
+      path.join(root, 'folder-a', 'file'),
+      path.join(root, 'symDir'),
+      path.join(root, 'symDir', 'file')
+    ])
+  })
+
+  it('defaults to implicitDescendants=true', async () => {
+    // Create the following layout:
+    //   <root>
+    //   <root>/folder-a
+    //   <root>/folder-a/file
+    const root = path.join(
+      getTestTemp(),
+      'defaults-to-implicit-descendants-true'
+    )
+    await fs.mkdir(path.join(root, 'folder-a'), {recursive: true})
+    await fs.writeFile(path.join(root, 'folder-a', 'file'), 'test file content')
+
+    const itemPaths = await glob(root, {})
+    expect(itemPaths).toEqual([
+      root,
+      path.join(root, 'folder-a'),
+      path.join(root, 'folder-a', 'file')
+    ])
+  })
+
+  it('defaults to omitBrokenSymbolicLinks=true', async () => {
+    // Create the following layout:
+    //   <root>
+    //   <root>/folder-a
+    //   <root>/folder-a/file
+    //   <root>/symDir -> <root>/no-such
+    const root = path.join(
+      getTestTemp(),
+      'defaults-to-omit-broken-symbolic-links-true'
+    )
+    await fs.mkdir(path.join(root, 'folder-a'), {recursive: true})
+    await fs.writeFile(path.join(root, 'folder-a', 'file'), 'test file content')
+    await createSymlinkDir(
+      path.join(root, 'no-such'),
+      path.join(root, 'symDir')
+    )
+
+    const itemPaths = await glob(root, {})
+    expect(itemPaths).toEqual([
+      root,
+      path.join(root, 'folder-a'),
+      path.join(root, 'folder-a', 'file')
+    ])
+  })
+
+  it('detects cycle when followSymbolicLinks=true', async () => {
     // Create the following layout:
     //   <root>
     //   <root>/file
     //   <root>/symDir -> <root>
-    const root = path.join(getTestTemp(), 'detects-cycle')
+    const root = path.join(getTestTemp(), 'detects-cycle-when-follow-true')
     await fs.mkdir(root, {recursive: true})
     await fs.writeFile(path.join(root, 'file'), 'test file content')
     await createSymlinkDir(root, path.join(root, 'symDir'))
 
-    const itemPaths = await glob.glob(root)
+    const itemPaths = await glob(root, {followSymbolicLinks: true})
     expect(itemPaths).toEqual([root, path.join(root, 'file')])
     // todo: ? expect(itemPaths[2]).toBe(path.join(root, 'symDir'))
   })
 
-  it('detects deep cycle starting from middle', async () => {
+  it('detects deep cycle starting from middle when followSymbolicLinks=true', async () => {
     // Create the following layout:
     //   <root>
     //   <root>/file-under-root
@@ -43,7 +150,7 @@ describe('glob', () => {
     //   <root>/folder-a/folder-b/folder-c/sym-folder -> <root>
     const root = path.join(
       getTestTemp(),
-      'detects-deep-cycle-starting-from-middle'
+      'detects-deep-cycle-starting-from-middle-when-follow-true'
     )
     await fs.mkdir(path.join(root, 'folder-a', 'folder-b', 'folder-c'), {
       recursive: true
@@ -79,7 +186,9 @@ describe('glob', () => {
       )
     )
 
-    const itemPaths = await glob.glob(path.join(root, 'folder-a', 'folder-b'))
+    const itemPaths = await glob(path.join(root, 'folder-a', 'folder-b'), {
+      followSymbolicLinks: true
+    })
     expect(itemPaths).toEqual([
       path.join(root, 'folder-a', 'folder-b'),
       path.join(root, 'folder-a', 'folder-b', 'file-under-b'),
@@ -114,21 +223,23 @@ describe('glob', () => {
     ])
   })
 
-  it('detects cycle starting from symlink', async () => {
+  it('detects cycle starting from symlink when followSymbolicLinks=true', async () => {
     // Create the following layout:
     //   <root>
     //   <root>/file
     //   <root>/symDir -> <root>
     const root: string = path.join(
       getTestTemp(),
-      'detects-cycle-starting-from-symlink'
+      'detects-cycle-starting-from-symlink-when-follow-true'
     )
     await fs.mkdir(root, {recursive: true})
     await fs.writeFile(path.join(root, 'file'), 'test file content')
     await createSymlinkDir(root, path.join(root, 'symDir'))
     await fs.stat(path.join(root, 'symDir'))
 
-    const itemPaths = await glob.glob(path.join(root, 'symDir'))
+    const itemPaths = await glob(path.join(root, 'symDir'), {
+      followSymbolicLinks: true
+    })
     expect(itemPaths).toEqual([
       path.join(root, 'symDir'),
       path.join(root, 'symDir', 'file')
@@ -136,7 +247,7 @@ describe('glob', () => {
     // todo: ? expect(itemPaths[2]).toBe(path.join(root, 'symDir', 'symDir'));
   })
 
-  it('does not follow symlink when followSymbolicLink=false', async () => {
+  it('does not follow symlink when followSymbolicLinks=false', async () => {
     // Create the following layout:
     //   <root>
     //   <root>/realDir
@@ -153,7 +264,7 @@ describe('glob', () => {
       path.join(root, 'symDir')
     )
 
-    const itemPaths = await glob.glob(root, {followSymbolicLinks: false})
+    const itemPaths = await glob(root, {followSymbolicLinks: false})
     expect(itemPaths).toEqual([
       root,
       path.join(root, 'realDir'),
@@ -162,7 +273,7 @@ describe('glob', () => {
     ])
   })
 
-  it('does not follow symlink when search path is symlink and followSymbolicLink=false', async () => {
+  it('does not follow symlink when search path is symlink and followSymbolicLinks=false', async () => {
     // Create the following layout:
     //   realDir
     //   realDir/file
@@ -178,20 +289,23 @@ describe('glob', () => {
       path.join(root, 'symDir')
     )
 
-    const itemPaths = await glob.glob(path.join(root, 'symDir'), {
+    const itemPaths = await glob(path.join(root, 'symDir'), {
       followSymbolicLinks: false
     })
     expect(itemPaths).toEqual([path.join(root, 'symDir')])
   })
 
-  it('does not return broken symlink', async () => {
+  it('does not return broken symlink when follow-true and omit-true', async () => {
     // Create the following layout:
     //   <root>
     //   <root>/brokenSym -> <root>/noSuch
     //   <root>/realDir
     //   <root>/realDir/file
     //   <root>/symDir -> <root>/realDir
-    const root = path.join(getTestTemp(), 'does-not-return-broken-symlink')
+    const root = path.join(
+      getTestTemp(),
+      'does-not-return-broken-symlink-when-follow-true-and-omit-true'
+    )
     await fs.mkdir(root, {recursive: true})
     await createSymlinkDir(
       path.join(root, 'noSuch'),
@@ -204,7 +318,7 @@ describe('glob', () => {
       path.join(root, 'symDir')
     )
 
-    const itemPaths = await glob.glob(root)
+    const itemPaths = await glob(root, {followSymbolicLinks: true})
     expect(itemPaths).toEqual([
       root,
       path.join(root, 'realDir'),
@@ -214,20 +328,20 @@ describe('glob', () => {
     ])
   })
 
-  it('does not return broken symlink when search path is broken symlink', async () => {
+  it('does not return broken symlink when search path is broken symlink and followSymbolicLinks=true', async () => {
     // Create the following layout:
     //   <root>
     //   <root>/brokenSym -> <root>/noSuch
     const root = path.join(
       getTestTemp(),
-      'does-not-return-broken-symlink-when-search-path-is-broken-symlink'
+      'does-not-return-broken-symlink-when-search-path-is-broken-symlink-and-follow-true'
     )
     await fs.mkdir(root, {recursive: true})
     const brokenSymPath = path.join(root, 'brokenSym')
     await createSymlinkDir(path.join(root, 'noSuch'), brokenSymPath)
     await fs.lstat(brokenSymPath)
 
-    const itemPaths = await glob.glob(brokenSymPath)
+    const itemPaths = await glob(brokenSymPath, {followSymbolicLinks: true})
     expect(itemPaths).toEqual([])
   })
 
@@ -255,29 +369,29 @@ describe('glob', () => {
       path.join(root, 'realDir2', 'nested2', 'symDir')
     )
 
-    const options: glob.IGlobOptions = {
+    const options: GlobOptions = {
       followSymbolicLinks: true,
       omitBrokenSymbolicLinks: false
     }
 
     // Should throw
     try {
-      await glob.glob(`${root}/*Dir*/*nested*/*`, options)
+      await glob(`${root}/*Dir*/*nested*/*`, options)
       throw new Error('should not reach here')
     } catch (err) {
       expect(err.message).toMatch(/broken symbolic link/i)
     }
 
     // Not partial match
-    let itemPaths = await glob.glob(`${root}/*Dir/*nested*/*`, options)
+    let itemPaths = await glob(`${root}/*Dir/*nested*/*`, options)
     expect(itemPaths).toEqual([path.join(root, 'realDir', 'nested', 'file')])
 
     // Not partial match
-    itemPaths = await glob.glob(`${root}/*Dir*/*nested/*`, options)
+    itemPaths = await glob(`${root}/*Dir*/*nested/*`, options)
     expect(itemPaths).toEqual([path.join(root, 'realDir', 'nested', 'file')])
   })
 
-  it('does not throw for broken symlinks that are not matches or partial matches', async () => {
+  it('does not throw for broken symlinks that are not matches or partial matches when followSymbolicLinks=true and omitBrokenSymbolicLinks=false', async () => {
     // Create the following layout:
     //   <root>
     //   <root>/realDir
@@ -285,20 +399,20 @@ describe('glob', () => {
     //   <root>/symDir -> <root>/noSuch
     const root = path.join(
       getTestTemp(),
-      'does-not-throw-for-broken-symlinks-that-are-not-matches-or-partial-matches'
+      'does-not-throw-for-broken-symlinks-that-are-not-matches-or-partial-matches-when-follow-true-and-omit-false'
     )
     await fs.mkdir(path.join(root, 'realDir'), {recursive: true})
     await fs.writeFile(path.join(root, 'realDir', 'file'), 'test file content')
     await createSymlinkDir(path.join(root, 'noSuch'), path.join(root, 'symDir'))
 
-    const options: glob.IGlobOptions = {
+    const options: GlobOptions = {
       followSymbolicLinks: true,
       omitBrokenSymbolicLinks: false
     }
 
     // Match should throw
     try {
-      await glob.glob(`${root}/*`, options)
+      await glob(`${root}/*`, options)
       throw new Error('should not reach here')
     } catch (err) {
       expect(err.message).toMatch(/broken symbolic link/i)
@@ -306,18 +420,18 @@ describe('glob', () => {
 
     // Partial match should throw
     try {
-      await glob.glob(`${root}/*/*`, options)
+      await glob(`${root}/*/*`, options)
       throw new Error('should not reach here')
     } catch (err) {
       expect(err.message).toMatch(/broken symbolic link/i)
     }
 
     // Not match or partial match
-    const itemPaths = await glob.glob(`${root}/*eal*/*`, options)
+    const itemPaths = await glob(`${root}/*eal*/*`, options)
     expect(itemPaths).toEqual([path.join(root, 'realDir', 'file')])
   })
 
-  it('follows symlink', async () => {
+  it('follows symlink when follow-symbolic-links=true', async () => {
     // Create the following layout:
     //   <root>
     //   <root>/realDir
@@ -331,7 +445,7 @@ describe('glob', () => {
       path.join(root, 'symDir')
     )
 
-    const itemPaths = await glob.glob(root)
+    const itemPaths = await glob(root, {followSymbolicLinks: true})
     expect(itemPaths).toEqual([
       root,
       path.join(root, 'realDir'),
@@ -341,14 +455,14 @@ describe('glob', () => {
     ])
   })
 
-  it('follows symlink when search path is symlink', async () => {
+  it('follows symlink when search path is symlink and follow-symbolic-links=true', async () => {
     // Create the following layout:
     //   realDir
     //   realDir/file
     //   symDir -> realDir
     const root = path.join(
       getTestTemp(),
-      'follows-symlink-when-search-path-is-symlink'
+      'follows-symlink-when-search-path-is-symlink-and-follow-true'
     )
     await fs.mkdir(path.join(root, 'realDir'), {recursive: true})
     await fs.writeFile(path.join(root, 'realDir', 'file'), 'test file content')
@@ -357,7 +471,9 @@ describe('glob', () => {
       path.join(root, 'symDir')
     )
 
-    const itemPaths = await glob.glob(path.join(root, 'symDir'))
+    const itemPaths = await glob(path.join(root, 'symDir'), {
+      followSymbolicLinks: true
+    })
     expect(itemPaths).toEqual([
       path.join(root, 'symDir'),
       path.join(root, 'symDir', 'file')
@@ -387,7 +503,7 @@ describe('glob', () => {
       path.join(root, 'symDir')
     )
 
-    const itemPaths = await glob.glob(root, {followSymbolicLinks: false})
+    const itemPaths = await glob(root, {followSymbolicLinks: false})
     expect(itemPaths).toEqual([
       root,
       path.join(root, 'brokenSym'),
@@ -409,9 +525,7 @@ describe('glob', () => {
     const brokenSymPath = path.join(root, 'brokenSym')
     await createSymlinkDir(path.join(root, 'noSuch'), brokenSymPath)
 
-    const itemPaths = await glob.glob(brokenSymPath, {
-      followSymbolicLinks: false
-    })
+    const itemPaths = await glob(brokenSymPath, {followSymbolicLinks: false})
     expect(itemPaths).toEqual([brokenSymPath])
   })
 
@@ -441,7 +555,7 @@ describe('glob', () => {
     )
     await fs.writeFile(path.join(root, 'c-file'), 'test c-file content')
 
-    const itemPaths = await glob.glob(root)
+    const itemPaths = await glob(root)
     expect(itemPaths).toEqual([
       root,
       path.join(root, 'a-file'),
@@ -470,11 +584,11 @@ describe('glob', () => {
     // When pattern ends with `/**/`
     let pattern = `${root}${path.sep}**${path.sep}`
     expect(
-      await glob.glob(pattern, {
+      await glob(pattern, {
         implicitDescendants: false
       })
     ).toHaveLength(3) // sanity check
-    expect(await glob.glob(pattern)).toEqual([
+    expect(await glob(pattern)).toEqual([
       root,
       path.join(root, 'dir-1'),
       path.join(root, 'dir-1', 'dir-2'),
@@ -486,11 +600,11 @@ describe('glob', () => {
     // When pattern ends with something other than `/**/`
     pattern = `${root}${path.sep}**${path.sep}dir-?`
     expect(
-      await glob.glob(pattern, {
+      await glob(pattern, {
         implicitDescendants: false
       })
     ).toHaveLength(2) // sanity check
-    expect(await glob.glob(pattern)).toEqual([
+    expect(await glob(pattern)).toEqual([
       path.join(root, 'dir-1'),
       path.join(root, 'dir-1', 'dir-2'),
       path.join(root, 'dir-1', 'dir-2', 'file-3'),
@@ -515,9 +629,9 @@ describe('glob', () => {
     await fs.writeFile(path.join(root, 'dir-1', 'dir-2', 'file-3'), '')
 
     const pattern = `${root}${path.sep}**${path.sep}`
-    expect(await glob.glob(pattern)).toHaveLength(6) // sanity check
+    expect(await glob(pattern)).toHaveLength(6) // sanity check
     expect(
-      await glob.glob(pattern, {
+      await glob(pattern, {
         implicitDescendants: false
       })
     ).toEqual([
@@ -528,7 +642,7 @@ describe('glob', () => {
   })
 
   it('returns empty when search path does not exist', async () => {
-    const itemPaths = await glob.glob(path.join(getTestTemp(), 'nosuch'))
+    const itemPaths = await glob(path.join(getTestTemp(), 'nosuch'))
     expect(itemPaths).toEqual([])
   })
 
@@ -548,7 +662,7 @@ describe('glob', () => {
       'test .folder/file content'
     )
 
-    const itemPaths = await glob.glob(root)
+    const itemPaths = await glob(root)
     expect(itemPaths).toEqual([
       root,
       path.join(root, '.emptyFolder'),
@@ -565,7 +679,7 @@ describe('glob', () => {
     await fs.mkdir(path.join(root, 'hello'), {recursive: true})
     await fs.writeFile(path.join(root, 'hello', 'world.txt'), '')
 
-    const itemPaths = await glob.glob(
+    const itemPaths = await glob(
       `${root}${path.sep}${path.sep}${path.sep}hello`
     )
     expect(itemPaths).toEqual([
@@ -574,13 +688,36 @@ describe('glob', () => {
     ])
   })
 
-  it('throws when match broken symlink and omitBrokenSymbolicLinks=false', async () => {
+  it('skips comments', async () => {
+    const searchPaths = await getSearchPaths(
+      `#aaa/*${os.EOL}/foo/*${os.EOL}#bbb/*${os.EOL}/bar/*`
+    )
+    const drive = IS_WINDOWS ? process.cwd().substr(0, 2) : ''
+    expect(searchPaths).toEqual([
+      IS_WINDOWS ? `${drive}\\foo` : '/foo',
+      IS_WINDOWS ? `${drive}\\bar` : '/bar'
+    ])
+  })
+
+  it('skips empty lines', async () => {
+    const searchPaths = await getSearchPaths(
+      `${os.EOL}${os.EOL}/foo/*${os.EOL}${os.EOL}/bar/*${os.EOL}/baz/**${os.EOL}`
+    )
+    const drive = IS_WINDOWS ? process.cwd().substr(0, 2) : ''
+    expect(searchPaths).toEqual([
+      IS_WINDOWS ? `${drive}\\foo` : '/foo',
+      IS_WINDOWS ? `${drive}\\bar` : '/bar',
+      IS_WINDOWS ? `${drive}\\baz` : '/baz'
+    ])
+  })
+
+  it('throws when match broken symlink and followSymbolicLinks=true and omitBrokenSymbolicLinks=false', async () => {
     // Create the following layout:
     //   <root>
     //   <root>/brokenSym -> <root>/noSuch
     const root = path.join(
       getTestTemp(),
-      'throws-when-match-broken-symlink-and-omit-false'
+      'throws-when-match-broken-symlink-and-follow-true-and-omit-false'
     )
     await fs.mkdir(root, {recursive: true})
     await createSymlinkDir(
@@ -589,20 +726,23 @@ describe('glob', () => {
     )
 
     try {
-      await glob.glob(root, {omitBrokenSymbolicLinks: false})
+      await glob(root, {
+        followSymbolicLinks: true,
+        omitBrokenSymbolicLinks: false
+      })
       throw new Error('Expected tl.find to throw')
     } catch (err) {
       expect(err.message).toMatch(/broken symbolic link/)
     }
   })
 
-  it('throws when search path is broken symlink and omitBrokenSymbolicLinks=false', async () => {
+  it('throws when search path is broken symlink and followSymbolicLinks=true and omitBrokenSymbolicLinks=false', async () => {
     // Create the following layout:
     //   <root>
     //   <root>/brokenSym -> <root>/noSuch
     const root = path.join(
       getTestTemp(),
-      'throws-when-search-path-is-broken-symlink-and-omit-false'
+      'throws-when-search-path-is-broken-symlink-and-follow-true-and-omit-false'
     )
     await fs.mkdir(root, {recursive: true})
     const brokenSymPath = path.join(root, 'brokenSym')
@@ -610,7 +750,10 @@ describe('glob', () => {
     await fs.lstat(brokenSymPath)
 
     try {
-      await glob.glob(brokenSymPath, {omitBrokenSymbolicLinks: false})
+      await glob(brokenSymPath, {
+        followSymbolicLinks: true,
+        omitBrokenSymbolicLinks: false
+      })
       throw new Error('Expected tl.find to throw')
     } catch (err) {
       expect(err.message).toMatch(/broken symbolic link/)
@@ -669,3 +812,16 @@ async function createSymlinkDir(real: string, link: string): Promise<void> {
     await fs.symlink(real, link)
   }
 }
+
+async function getSearchPaths(patterns: string): Promise<string[]> {
+  const globber: Globber = await DefaultGlobber.create(patterns)
+  return globber.getSearchPaths()
+}
+
+async function glob(
+  patterns: string,
+  options?: GlobOptions
+): Promise<string[]> {
+  const globber: Globber = await DefaultGlobber.create(patterns, options)
+  return await globber.glob()
+}
diff --git a/packages/glob/__tests__/internal-pattern-helper.test.ts b/packages/glob/__tests__/internal-pattern-helper.test.ts
index dc8b0de9..1d60f6b3 100644
--- a/packages/glob/__tests__/internal-pattern-helper.test.ts
+++ b/packages/glob/__tests__/internal-pattern-helper.test.ts
@@ -2,18 +2,16 @@ import * as path from 'path'
 import * as patternHelper from '../src/internal-pattern-helper'
 import {MatchKind} from '../src/internal-match-kind'
 import {IS_WINDOWS} from '../../io/src/io-util'
+import {Pattern} from '../src/internal-pattern'
 
 describe('pattern-helper', () => {
   it('getSearchPaths omits negate search paths', () => {
     const root = IS_WINDOWS ? 'C:\\' : '/'
-    const patterns = patternHelper.parse(
-      [
-        `${root}search1/foo/**`,
-        `${root}search2/bar/**`,
-        `!${root}search3/baz/**`
-      ],
-      patternHelper.getOptions()
-    )
+    const patterns = [
+      `${root}search1/foo/**`,
+      `${root}search2/bar/**`,
+      `!${root}search3/baz/**`
+    ].map(x => new Pattern(x))
     const searchPaths = patternHelper.getSearchPaths(patterns)
     expect(searchPaths).toEqual([
       `${root}search1${path.sep}foo`,
@@ -23,17 +21,14 @@ describe('pattern-helper', () => {
 
   it('getSearchPaths omits search path when ancestor is also a search path', () => {
     if (IS_WINDOWS) {
-      const patterns = patternHelper.parse(
-        [
-          'C:\\Search1\\Foo\\**',
-          'C:\\sEARCH1\\fOO\\bar\\**',
-          'C:\\sEARCH1\\foo\\bar',
-          'C:\\Search2\\**',
-          'C:\\Search3\\Foo\\Bar\\**',
-          'C:\\sEARCH3\\fOO\\bAR\\**'
-        ],
-        patternHelper.getOptions()
-      )
+      const patterns = [
+        'C:\\Search1\\Foo\\**',
+        'C:\\sEARCH1\\fOO\\bar\\**',
+        'C:\\sEARCH1\\foo\\bar',
+        'C:\\Search2\\**',
+        'C:\\Search3\\Foo\\Bar\\**',
+        'C:\\sEARCH3\\fOO\\bAR\\**'
+      ].map(x => new Pattern(x))
       const searchPaths = patternHelper.getSearchPaths(patterns)
       expect(searchPaths).toEqual([
         'C:\\Search1\\Foo',
@@ -41,17 +36,15 @@ describe('pattern-helper', () => {
         'C:\\Search3\\Foo\\Bar'
       ])
     } else {
-      const patterns = patternHelper.parse(
-        [
-          '/search1/foo/**',
-          '/search1/foo/bar/**',
-          '/search2/foo/bar',
-          '/search2/**',
-          '/search3/foo/bar/**',
-          '/search3/foo/bar/**'
-        ],
-        patternHelper.getOptions()
-      )
+      const patterns = [
+        '/search1/foo/**',
+        '/search1/foo/bar/**',
+        '/search2/foo/bar',
+        '/search2/**',
+        '/search3/foo/bar/**',
+        '/search3/foo/bar/**'
+      ].map(x => new Pattern(x))
+
       const searchPaths = patternHelper.getSearchPaths(patterns)
       expect(searchPaths).toEqual([
         '/search1/foo',
@@ -75,16 +68,13 @@ describe('pattern-helper', () => {
       `${root}solution2/proj2/README.txt`,
       `${root}solution2/solution2.sln`
     ]
-    const patterns = patternHelper.parse(
-      [
-        `${root}**/*.proj`, // include all proj files
-        `${root}**/README.txt`, // include all README files
-        `!${root}**/solution2/**`, // exclude the solution 2 folder entirely
-        `${root}**/*.sln`, // include all sln files
-        `!${root}**/proj2/README.txt` // exclude proj2 README files
-      ],
-      patternHelper.getOptions({implicitDescendants: false})
-    )
+    const patterns = [
+      `${root}**/*.proj`, // include all proj files
+      `${root}**/README.txt`, // include all README files
+      `!${root}**/solution2/**`, // exclude the solution 2 folder entirely
+      `${root}**/*.sln`, // include all sln files
+      `!${root}**/proj2/README.txt` // exclude proj2 README files
+    ].map(x => new Pattern(x))
     const matched = itemPaths.filter(
       x => patternHelper.match(patterns, x) === MatchKind.All
     )
@@ -105,13 +95,10 @@ describe('pattern-helper', () => {
       `${root}foo/bar`,
       `${root}foo/bar/baz`
     ]
-    const patterns = patternHelper.parse(
-      [
-        `${root}foo/**`, // include all files and directories
-        `!${root}foo/**/` // exclude directories
-      ],
-      patternHelper.getOptions({implicitDescendants: false})
-    )
+    const patterns = [
+      `${root}foo/**`, // include all files and directories
+      `!${root}foo/**/` // exclude directories
+    ].map(x => new Pattern(x))
     const matchKinds = itemPaths.map(x => patternHelper.match(patterns, x))
     expect(matchKinds).toEqual([
       MatchKind.None,
@@ -129,12 +116,9 @@ describe('pattern-helper', () => {
       `${root}foo/bar`,
       `${root}foo/bar/baz`
     ]
-    const patterns = patternHelper.parse(
-      [
-        `${root}foo/**/` // include directories only
-      ],
-      patternHelper.getOptions({implicitDescendants: false})
-    )
+    const patterns = [
+      `${root}foo/**/` // include directories only
+    ].map(x => new Pattern(x))
     const matchKinds = itemPaths.map(x => patternHelper.match(patterns, x))
     expect(matchKinds).toEqual([
       MatchKind.None,
@@ -144,36 +128,14 @@ describe('pattern-helper', () => {
     ])
   })
 
-  it('parse skips comments', () => {
-    const patterns = patternHelper.parse(
-      ['# comment 1', ' # comment 2', '!#hello-world.txt'],
-      patternHelper.getOptions({implicitDescendants: false})
-    )
-    expect(patterns).toHaveLength(1)
-    expect(patterns[0].negate).toBeTruthy()
-    expect(patterns[0].segments.reverse()[0]).toEqual('#hello-world.txt')
-  })
-
-  it('parse skips empty patterns', () => {
-    const patterns = patternHelper.parse(
-      ['', ' ', 'hello-world.txt'],
-      patternHelper.getOptions({implicitDescendants: false})
-    )
-    expect(patterns).toHaveLength(1)
-    expect(patterns[0].segments.reverse()[0]).toEqual('hello-world.txt')
-  })
-
   it('partialMatch skips negate patterns', () => {
     const root = IS_WINDOWS ? 'C:\\' : '/'
-    const patterns = patternHelper.parse(
-      [
-        `${root}search1/foo/**`,
-        `${root}search2/bar/**`,
-        `!${root}search2/bar/**`,
-        `!${root}search3/baz/**`
-      ],
-      patternHelper.getOptions({implicitDescendants: false})
-    )
+    const patterns = [
+      `${root}search1/foo/**`,
+      `${root}search2/bar/**`,
+      `!${root}search2/bar/**`,
+      `!${root}search3/baz/**`
+    ].map(x => new Pattern(x))
     expect(patternHelper.partialMatch(patterns, `${root}search1`)).toBeTruthy()
     expect(
       patternHelper.partialMatch(patterns, `${root}search1/foo`)
diff --git a/packages/glob/src/glob.ts b/packages/glob/src/glob.ts
index 861e1e8f..02fc9cc1 100644
--- a/packages/glob/src/glob.ts
+++ b/packages/glob/src/glob.ts
@@ -1,183 +1,17 @@
-import * as core from '@actions/core'
-import * as fs from 'fs'
-import * as path from 'path'
-import * as patternHelper from './internal-pattern-helper'
-import {IGlobOptions} from './internal-glob-options'
-import {MatchKind} from './internal-match-kind'
-import {Pattern} from './internal-pattern'
-import {SearchState} from './internal-search-state'
+import {Globber, DefaultGlobber} from './internal-globber'
+import {GlobOptions} from './internal-glob-options'
 
-export {IGlobOptions}
+export {Globber, GlobOptions}
 
 /**
- * Returns files and directories matching the specified glob pattern.
+ * Constructs a globber
  *
- * Order of the results is not guaranteed.
+ * @param patterns  Patterns separated by newlines
+ * @param options   Glob options
  */
-export async function glob(
-  pattern: string,
-  options?: IGlobOptions
-): Promise<string[]> {
-  const result: string[] = []
-  for await (const itemPath of globGenerator(pattern, options)) {
-    result.push(itemPath)
-  }
-  return result
-}
-
-/**
- * Returns files and directories matching the specified glob pattern.
- *
- * Order of the results is not guaranteed.
- */
-export async function* globGenerator(
-  pattern: string,
-  options?: IGlobOptions
-): AsyncGenerator<string, void> {
-  // Set defaults options
-  options = patternHelper.getOptions(options)
-
-  // Parse patterns
-  const patterns: Pattern[] = patternHelper.parse([pattern], options)
-
-  // Push the search paths
-  const stack: SearchState[] = []
-  for (const searchPath of patternHelper.getSearchPaths(patterns)) {
-    core.debug(`Search path '${searchPath}'`)
-
-    // Exists?
-    try {
-      // Intentionally using lstat. Detection for broken symlink
-      // will be performed later (if following symlinks).
-      await fs.promises.lstat(searchPath)
-    } catch (err) {
-      if (err.code === 'ENOENT') {
-        continue
-      }
-      throw err
-    }
-
-    stack.unshift(new SearchState(searchPath, 1))
-  }
-
-  // Search
-  const traversalChain: string[] = [] // used to detect cycles
-  while (stack.length) {
-    // Pop
-    const item = stack.pop() as SearchState
-
-    // Match?
-    const match = patternHelper.match(patterns, item.path)
-    const partialMatch =
-      !!match || patternHelper.partialMatch(patterns, item.path)
-    if (!match && !partialMatch) {
-      continue
-    }
-
-    // Stat
-    const stats: fs.Stats | undefined = await stat(
-      item,
-      options,
-      traversalChain
-    )
-
-    // Broken symlink, or symlink cycle detected, or no longer exists
-    if (!stats) {
-      continue
-    }
-
-    // Directory
-    if (stats.isDirectory()) {
-      // Matched
-      if (match & MatchKind.Directory) {
-        yield item.path
-      }
-      // Descend?
-      else if (!partialMatch) {
-        continue
-      }
-
-      // Push the child items in reverse
-      const childLevel = item.level + 1
-      const childItems = (await fs.promises.readdir(item.path)).map(
-        x => new SearchState(path.join(item.path, x), childLevel)
-      )
-      stack.push(...childItems.reverse())
-    }
-    // File
-    else if (match & MatchKind.File) {
-      yield item.path
-    }
-  }
-}
-
-/**
- * Returns the search path preceeding the first segment that contains a pattern.
- *
- * For example, '/foo/bar*' returns '/foo'.
- */
-export function getSearchPath(pattern: string): string {
-  const patterns: Pattern[] = patternHelper.parse(
-    [pattern],
-    patternHelper.getOptions()
-  )
-  const searchPaths: string[] = patternHelper.getSearchPaths(patterns)
-  return searchPaths.length > 0 ? searchPaths[0] : ''
-}
-
-async function stat(
-  item: SearchState,
-  options: IGlobOptions,
-  traversalChain: string[]
-): Promise<fs.Stats | undefined> {
-  // Note:
-  // `stat` returns info about the target of a symlink (or symlink chain)
-  // `lstat` returns info about a symlink itself
-  let stats: fs.Stats
-  if (options.followSymbolicLinks) {
-    try {
-      // Use `stat` (following symlinks)
-      stats = await fs.promises.stat(item.path)
-    } catch (err) {
-      if (err.code === 'ENOENT') {
-        if (options.omitBrokenSymbolicLinks) {
-          core.debug(`Broken symlink '${item.path}'`)
-          return undefined
-        }
-
-        throw new Error(
-          `No information found for the path '${item.path}'. This may indicate a broken symbolic link.`
-        )
-      }
-
-      throw err
-    }
-  } else {
-    // Use `lstat` (not following symlinks)
-    stats = await fs.promises.lstat(item.path)
-  }
-
-  // Note, isDirectory() returns false for the lstat of a symlink
-  if (stats.isDirectory() && options.followSymbolicLinks) {
-    // Get the realpath
-    const realPath: string = await fs.promises.realpath(item.path)
-
-    // Fixup the traversal chain to match the item level
-    while (traversalChain.length >= item.level) {
-      traversalChain.pop()
-    }
-
-    // Test for a cycle
-    if (traversalChain.some((x: string) => x === realPath)) {
-      core.debug(
-        `Symlink cycle detected for path '${item.path}' and realpath '${realPath}'`
-      )
-      return undefined
-    }
-
-    // Update the traversal chain
-    traversalChain.push(realPath)
-  }
-
-  return stats
+export async function create(
+  patterns: string,
+  options?: GlobOptions
+): Promise<Globber> {
+  return await DefaultGlobber.create(patterns, options)
 }
diff --git a/packages/glob/src/internal-glob-options-helper.ts b/packages/glob/src/internal-glob-options-helper.ts
new file mode 100644
index 00000000..3c81b671
--- /dev/null
+++ b/packages/glob/src/internal-glob-options-helper.ts
@@ -0,0 +1,32 @@
+import * as core from '@actions/core'
+import {GlobOptions} from './internal-glob-options'
+
+/**
+ * Returns a copy with defaults filled in.
+ */
+export function getOptions(copy?: GlobOptions): GlobOptions {
+  const result: GlobOptions = {
+    followSymbolicLinks: true,
+    implicitDescendants: true,
+    omitBrokenSymbolicLinks: true
+  }
+
+  if (copy) {
+    if (typeof copy.followSymbolicLinks === 'boolean') {
+      result.followSymbolicLinks = copy.followSymbolicLinks
+      core.debug(`followSymbolicLinks '${result.followSymbolicLinks}'`)
+    }
+
+    if (typeof copy.implicitDescendants === 'boolean') {
+      result.implicitDescendants = copy.implicitDescendants
+      core.debug(`implicitDescendants '${result.implicitDescendants}'`)
+    }
+
+    if (typeof copy.omitBrokenSymbolicLinks === 'boolean') {
+      result.omitBrokenSymbolicLinks = copy.omitBrokenSymbolicLinks
+      core.debug(`omitBrokenSymbolicLinks '${result.omitBrokenSymbolicLinks}'`)
+    }
+  }
+
+  return result
+}
diff --git a/packages/glob/src/internal-glob-options.ts b/packages/glob/src/internal-glob-options.ts
index 8e427454..54d8b544 100644
--- a/packages/glob/src/internal-glob-options.ts
+++ b/packages/glob/src/internal-glob-options.ts
@@ -1,7 +1,10 @@
-export interface IGlobOptions {
+/**
+ * Options to control globbing behavior
+ */
+export interface GlobOptions {
   /**
-   * Indicates whether to follow symbolic links. Generally should be true
-   * unless deleting files.
+   * Indicates whether to follow symbolic links. Generally should set to false
+   * when deleting files.
    *
    * @default true
    */
diff --git a/packages/glob/src/internal-globber.ts b/packages/glob/src/internal-globber.ts
new file mode 100644
index 00000000..a84d298d
--- /dev/null
+++ b/packages/glob/src/internal-globber.ts
@@ -0,0 +1,242 @@
+import * as core from '@actions/core'
+import * as fs from 'fs'
+import * as globOptionsHelper from './internal-glob-options-helper'
+import * as path from 'path'
+import * as patternHelper from './internal-pattern-helper'
+import {GlobOptions} from './internal-glob-options'
+import {MatchKind} from './internal-match-kind'
+import {Pattern} from './internal-pattern'
+import {SearchState} from './internal-search-state'
+
+const IS_WINDOWS = process.platform === 'win32'
+
+export {GlobOptions}
+
+/**
+ * Used to match files and directories
+ */
+export interface Globber {
+  /**
+   * Returns the search path preceeding the first glob segment, from each pattern.
+   * Duplicates and descendants of other paths are filtered out.
+   *
+   * Example 1: The patterns `/foo/*` and `/bar/*` returns `/foo` and `/bar`.
+   *
+   * Example 2: The patterns `/foo/*` and `/foo/bar/*` returns `/foo`.
+   */
+  getSearchPaths(): string[]
+
+  /**
+   * Returns files and directories matching the glob patterns.
+   *
+   * Order of the results is not guaranteed.
+   */
+  glob(): Promise<string[]>
+
+  /**
+   * Returns files and directories matching the glob patterns.
+   *
+   * Order of the results is not guaranteed.
+   */
+  globGenerator(): AsyncGenerator<string, void>
+}
+
+export class DefaultGlobber implements Globber {
+  private readonly options: GlobOptions
+  private readonly patterns: Pattern[] = []
+  private readonly searchPaths: string[] = []
+
+  private constructor(options?: GlobOptions) {
+    this.options = globOptionsHelper.getOptions(options)
+  }
+
+  getSearchPaths(): string[] {
+    // Return a copy
+    return this.searchPaths.slice()
+  }
+
+  async glob(): Promise<string[]> {
+    const result: string[] = []
+    for await (const itemPath of this.globGenerator()) {
+      result.push(itemPath)
+    }
+    return result
+  }
+
+  async *globGenerator(): AsyncGenerator<string, void> {
+    // Fill in defaults options
+    const options = globOptionsHelper.getOptions(this.options)
+
+    // Implicit descendants?
+    const patterns: Pattern[] = []
+    for (const pattern of this.patterns) {
+      patterns.push(pattern)
+      if (
+        options.implicitDescendants &&
+        (pattern.trailingSeparator ||
+          pattern.segments[pattern.segments.length - 1] !== '**')
+      ) {
+        patterns.push(
+          new Pattern(pattern.negate, pattern.segments.concat('**'))
+        )
+      }
+    }
+
+    // Push the search paths
+    const stack: SearchState[] = []
+    for (const searchPath of patternHelper.getSearchPaths(patterns)) {
+      core.debug(`Search path '${searchPath}'`)
+
+      // Exists?
+      try {
+        // Intentionally using lstat. Detection for broken symlink
+        // will be performed later (if following symlinks).
+        await fs.promises.lstat(searchPath)
+      } catch (err) {
+        if (err.code === 'ENOENT') {
+          continue
+        }
+        throw err
+      }
+
+      stack.unshift(new SearchState(searchPath, 1))
+    }
+
+    // Search
+    const traversalChain: string[] = [] // used to detect cycles
+    while (stack.length) {
+      // Pop
+      const item = stack.pop() as SearchState
+
+      // Match?
+      const match = patternHelper.match(patterns, item.path)
+      const partialMatch =
+        !!match || patternHelper.partialMatch(patterns, item.path)
+      if (!match && !partialMatch) {
+        continue
+      }
+
+      // Stat
+      const stats: fs.Stats | undefined = await DefaultGlobber.stat(
+        item,
+        options,
+        traversalChain
+      )
+
+      // Broken symlink, or symlink cycle detected, or no longer exists
+      if (!stats) {
+        continue
+      }
+
+      // Directory
+      if (stats.isDirectory()) {
+        // Matched
+        if (match & MatchKind.Directory) {
+          yield item.path
+        }
+        // Descend?
+        else if (!partialMatch) {
+          continue
+        }
+
+        // Push the child items in reverse
+        const childLevel = item.level + 1
+        const childItems = (await fs.promises.readdir(item.path)).map(
+          x => new SearchState(path.join(item.path, x), childLevel)
+        )
+        stack.push(...childItems.reverse())
+      }
+      // File
+      else if (match & MatchKind.File) {
+        yield item.path
+      }
+    }
+  }
+
+  /**
+   * Constructs a DefaultGlobber
+   */
+  static async create(
+    patterns: string,
+    options?: GlobOptions
+  ): Promise<DefaultGlobber> {
+    const result = new DefaultGlobber(options)
+
+    if (IS_WINDOWS) {
+      patterns = patterns.replace(/\r\n/g, '\n')
+      patterns = patterns.replace(/\r/g, '\n')
+    }
+
+    const lines = patterns.split('\n').map(x => x.trim())
+    for (const line of lines) {
+      // Empty or comment
+      if (!line || line.startsWith('#')) {
+        continue
+      }
+      // Pattern
+      else {
+        result.patterns.push(new Pattern(line))
+      }
+    }
+
+    result.searchPaths.push(...patternHelper.getSearchPaths(result.patterns))
+    return result
+  }
+
+  private static async stat(
+    item: SearchState,
+    options: GlobOptions,
+    traversalChain: string[]
+  ): Promise<fs.Stats | undefined> {
+    // Note:
+    // `stat` returns info about the target of a symlink (or symlink chain)
+    // `lstat` returns info about a symlink itself
+    let stats: fs.Stats
+    if (options.followSymbolicLinks) {
+      try {
+        // Use `stat` (following symlinks)
+        stats = await fs.promises.stat(item.path)
+      } catch (err) {
+        if (err.code === 'ENOENT') {
+          if (options.omitBrokenSymbolicLinks) {
+            core.debug(`Broken symlink '${item.path}'`)
+            return undefined
+          }
+
+          throw new Error(
+            `No information found for the path '${item.path}'. This may indicate a broken symbolic link.`
+          )
+        }
+
+        throw err
+      }
+    } else {
+      // Use `lstat` (not following symlinks)
+      stats = await fs.promises.lstat(item.path)
+    }
+
+    // Note, isDirectory() returns false for the lstat of a symlink
+    if (stats.isDirectory() && options.followSymbolicLinks) {
+      // Get the realpath
+      const realPath: string = await fs.promises.realpath(item.path)
+
+      // Fixup the traversal chain to match the item level
+      while (traversalChain.length >= item.level) {
+        traversalChain.pop()
+      }
+
+      // Test for a cycle
+      if (traversalChain.some((x: string) => x === realPath)) {
+        core.debug(
+          `Symlink cycle detected for path '${item.path}' and realpath '${realPath}'`
+        )
+        return undefined
+      }
+
+      // Update the traversal chain
+      traversalChain.push(realPath)
+    }
+
+    return stats
+  }
+}
diff --git a/packages/glob/src/internal-pattern-helper.ts b/packages/glob/src/internal-pattern-helper.ts
index 9ca56b14..e0cf3a6a 100644
--- a/packages/glob/src/internal-pattern-helper.ts
+++ b/packages/glob/src/internal-pattern-helper.ts
@@ -1,41 +1,9 @@
-import * as core from '@actions/core'
 import * as pathHelper from './internal-path-helper'
-import {IGlobOptions} from './internal-glob-options'
 import {MatchKind} from './internal-match-kind'
 import {Pattern} from './internal-pattern'
 
 const IS_WINDOWS = process.platform === 'win32'
 
-/**
- * Returns a copy with defaults filled in
- */
-export function getOptions(copy?: IGlobOptions): IGlobOptions {
-  const result: IGlobOptions = {
-    followSymbolicLinks: true,
-    implicitDescendants: true,
-    omitBrokenSymbolicLinks: true
-  }
-
-  if (copy) {
-    if (typeof copy.followSymbolicLinks === 'boolean') {
-      result.followSymbolicLinks = copy.followSymbolicLinks
-      core.debug(`followSymbolicLinks '${result.followSymbolicLinks}'`)
-    }
-
-    if (typeof copy.implicitDescendants === 'boolean') {
-      result.implicitDescendants = copy.implicitDescendants
-      core.debug(`implicitDescendants '${result.implicitDescendants}'`)
-    }
-
-    if (typeof copy.omitBrokenSymbolicLinks === 'boolean') {
-      result.omitBrokenSymbolicLinks = copy.omitBrokenSymbolicLinks
-      core.debug(`omitBrokenSymbolicLinks '${result.omitBrokenSymbolicLinks}'`)
-    }
-  }
-
-  return result
-}
-
 /**
  * Given an array of patterns, returns an array of paths to search.
  * Duplicates and paths under other included paths are filtered out.
@@ -105,36 +73,6 @@ export function match(patterns: Pattern[], itemPath: string): MatchKind {
   return result
 }
 
-/**
- * Parses the pattern strings into Pattern objects
- */
-export function parse(patterns: string[], options: IGlobOptions): Pattern[] {
-  const result: Pattern[] = []
-
-  for (const patternString of patterns.map(x => x.trim())) {
-    // Skip empty or comment
-    if (!patternString || patternString.startsWith('#')) {
-      continue
-    }
-
-    // Push
-    const pattern = new Pattern(patternString)
-    result.push(pattern)
-
-    // Implicit descendants?
-    if (
-      options.implicitDescendants &&
-      (pattern.trailingSeparator ||
-        pattern.segments[pattern.segments.length - 1] !== '**')
-    ) {
-      // Push
-      result.push(new Pattern(pattern.negate, pattern.segments.concat('**')))
-    }
-  }
-
-  return result
-}
-
 /**
  * Checks whether to descend further into the directory
  */