feat: allow script wrapper length to be specified (bcoe#51)

Author: bcoe

bin/c8.js

@@ -26,7 +26,8 @@ function outputReport () {
     tempDirectory: argv.tempDirectory,
     watermarks: argv.watermarks,
     resolve: argv.resolve,
-    omitRelative: argv.omitRelative
+    omitRelative: argv.omitRelative,
+    wrapperLength: argv.wrapperLength
   })
 }
 

lib/parse-args.js

@@ -32,6 +32,10 @@ yargs()
     default: '',
     describe: 'resolve paths to alternate base directory'
   })
+  .option('wrapper-length', {
+    describe: 'how many bytes is the wrapper prefix on executed JavaScript',
+    type: 'number'
+  })
   .option('omit-relative', {
     default: true,
     type: 'boolean',

lib/report.js

@@ -15,7 +15,8 @@ class Report {
     tempDirectory,
     watermarks,
     resolve,
-    omitRelative
+    omitRelative,
+    wrapperLength
   }) {
     this.reporter = reporter
     this.tempDirectory = tempDirectory
@@ -26,6 +27,7 @@ class Report {
       include: include
     })
     this.omitRelative = omitRelative
+    this.wrapperLength = wrapperLength
   }
   run () {
     const map = this._getCoverageMapFromAllCoverageFiles()
@@ -49,7 +51,7 @@ class Report {
     for (const v8ScriptCov of v8ProcessCov.result) {
       try {
         const path = resolve(this.resolve, v8ScriptCov.url)
-        const script = v8toIstanbul(path)
+        const script = v8toIstanbul(path, this.wrapperLength)
         script.applyCoverage(v8ScriptCov.functions)
         map.merge(script.toIstanbul())
       } catch (err) {

package-lock.json

@@ -41,7 +41,7 @@
     "rimraf": "^2.6.2",
     "test-exclude": "^5.0.0",
     "uuid": "^3.3.2",
-    "v8-to-istanbul": "^1.2.0",
+    "v8-to-istanbul": "^2.0.0",
     "yargs": "^12.0.2",
     "yargs-parser": "^10.1.0"
   },

package.json

@@ -8,12 +8,12 @@ second
 --------------------|----------|----------|----------|----------|-------------------|
 File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
 --------------------|----------|----------|----------|----------|-------------------|
-All files           |       95 |    72.22 |        0 |       95 |                   |
- bin                |    87.76 |     62.5 |      100 |    87.76 |                   |
-  c8.js             |    87.76 |     62.5 |      100 |    87.76 | 35,39,46,47,48,49 |
- lib                |    96.65 |    62.07 |      100 |    96.65 |                   |
-  parse-args.js     |    97.47 |    44.44 |      100 |    97.47 |             55,56 |
-  report.js         |    96.15 |       70 |      100 |    96.15 |    56,57,95,96,97 |
+All files           |    95.11 |    72.22 |        0 |    95.11 |                   |
+ bin                |       88 |     62.5 |      100 |       88 |                   |
+  c8.js             |       88 |     62.5 |      100 |       88 | 36,40,47,48,49,50 |
+ lib                |    96.74 |    62.07 |      100 |    96.74 |                   |
+  parse-args.js     |    97.59 |    44.44 |      100 |    97.59 |             59,60 |
+  report.js         |    96.21 |       70 |      100 |    96.21 |    58,59,97,98,99 |
  test/fixtures      |    95.16 |    94.12 |        0 |    95.16 |                   |
   async.js          |      100 |      100 |      100 |      100 |                   |
   multiple-spawn.js |      100 |      100 |      100 |      100 |                   |