Remove magic-string (#6772)

* Remove magic-string

* Add back input

* change if statement back

* Fix typo

* remomve useless import

packages/next/build/webpack/plugins/serverless-plugin.ts

-import MagicString from 'magic-string'
 import { Compiler } from 'webpack'
 import { SourceMapSource, RawSource } from 'webpack-sources'
 import GraphHelpers from 'webpack/lib/GraphHelpers'
@@ -64,28 +63,16 @@ export class ServerlessPlugin {
                   input = asset.source()
                 }
 
-                const f = new MagicString(input)
-
-                const regex = new RegExp(NEXT_REPLACE_BUILD_ID, 'g')
-                let result
-                while ((result = regex.exec(input))) {
-                  f.overwrite(
-                    result.index,
-                    result.index + NEXT_REPLACE_BUILD_ID.length,
-                    this.buildId
-                  )
-                }
-
+                const output = input.replace(NEXT_REPLACE_BUILD_ID, this.buildId)
+                
                 if (this.sourceMap && inputSourceMap) {
                   compilation.assets[file] = new SourceMapSource(
-                    f.toString(),
+                    output,
                     file,
-                    f.generateMap({ hires: true }),
-                    input,
                     inputSourceMap
                   )
                 } else {
-                  compilation.assets[file] = new RawSource(f.toString())
+                  compilation.assets[file] = new RawSource(output)
                 }
               })
           }

packages/next/package.json

@@ -63,7 +63,6 @@
     "imurmurhash": "0.1.4",
     "launch-editor": "2.2.1",
     "loader-utils": "1.1.0",
-    "magic-string": "0.25.2",
     "mkdirp": "0.5.1",
     "next-server": "8.0.4-canary.20",
     "prop-types": "15.6.2",

yarn.lock

@@ -8046,13 +8046,6 @@ macos-release@^2.0.0:
   resolved "https://registry.yarnpkg.com/macos-release/-/macos-release-2.0.0.tgz#7dddf4caf79001a851eb4fba7fb6034f251276ab"
   integrity sha512-iCM3ZGeqIzlrH7KxYK+fphlJpCCczyHXc+HhRVbEu9uNTCrzYJjvvtefzeKTCVHd5AP/aD/fzC80JZ4ZP+dQ/A==
 
-magic-string@0.25.2:
-  version "0.25.2"
-  resolved "https://registry.yarnpkg.com/magic-string/-/magic-string-0.25.2.tgz#139c3a729515ec55e96e69e82a11fe890a293ad9"
-  integrity sha512-iLs9mPjh9IuTtRsqqhNGYcZXGei0Nh/A4xirrsqW7c+QhKVFL2vm7U09ru6cHRD22azaP/wMDgI+HCqbETMTtg==
-  dependencies:
-    sourcemap-codec "^1.4.4"
-
 make-dir@^1.0.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/make-dir/-/make-dir-1.3.0.tgz#79c1033b80515bd6d24ec9933e860ca75ee27f0c"
@@ -11384,11 +11377,6 @@ source-map@^0.5.0, source-map@^0.5.3, source-map@^0.5.6, source-map@^0.5.7:
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
   integrity sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=
 
-sourcemap-codec@^1.4.4:
-  version "1.4.4"
-  resolved "https://registry.yarnpkg.com/sourcemap-codec/-/sourcemap-codec-1.4.4.tgz#c63ea927c029dd6bd9a2b7fa03b3fec02ad56e9f"
-  integrity sha512-CYAPYdBu34781kLHkaW3m6b/uUSyMOC2R61gcYMWooeuaGtjof86ZA/8T+qVPPt7np1085CR9hmMGrySwEc8Xg==
-
 spawn-sync@^1.0.15:
   version "1.0.15"
   resolved "https://registry.yarnpkg.com/spawn-sync/-/spawn-sync-1.0.15.tgz#b00799557eb7fb0c8376c29d44e8a1ea67e57476"