Add import.meta support.

Author: goto-bus-stop

build.js

@@ -17,4 +17,4 @@ function compile (name, output) { // eslint-disable-line no-unused-vars
   fs.writeFileSync(path.join(__dirname, output), HEADER + result.code, 'utf8')
 }
 
-console.log('Nothing to do right now!')
+compile('acorn-import-meta/inject', './lib/import-meta/index.js')

index.js

@@ -8,7 +8,8 @@ function mapOptions (opts) {
     allowHashBang: true,
     allowReturnOutsideFunction: true,
     plugins: {
-      dynamicImport: opts.sourceType === 'module'
+      dynamicImport: opts.sourceType === 'module',
+      importMeta: opts.sourceType === 'module'
     }
   }, opts)
   opts.plugins = xtend(opts.plugins, {})
@@ -28,3 +29,4 @@ module.exports = exports = xtend(acorn, {
 })
 
 require('acorn-dynamic-import/lib/inject').default(exports)
+require('./lib/import-meta')(exports)

lib/import-meta/index.js

@@ -0,0 +1,50 @@
+/* Generated by `npm run build`, do not edit! */
+
+"use strict"
+
+var skipWhiteSpace = /(?:\s|\/\/.*|\/\*[^]*?\*\/)*/g
+
+module.exports = function (acorn) {
+  var tt = acorn.tokTypes
+
+  var nextTokenIsDot = function (parser) {
+    skipWhiteSpace.lastIndex = parser.pos
+    var skip = skipWhiteSpace.exec(parser.input)
+    var next = parser.pos + skip[0].length
+    return parser.input.slice(next, next + 1) === "."
+  }
+
+  acorn.plugins.importMeta = function (instance) {
+
+    instance.extend("parseExprAtom", function (superF) {
+      return function(refDestructuringErrors) {
+        if (this.type !== tt._import || !nextTokenIsDot(this)) { return superF.call(this, refDestructuringErrors) }
+
+        if (!this.options.allowImportExportEverywhere && !this.inModule) {
+          this.raise(this.start, "'import' and 'export' may appear only with 'sourceType: module'")
+        }
+
+        var node = this.startNode()
+        node.meta = this.parseIdent(true)
+        this.expect(tt.dot)
+        node.property = this.parseIdent(true)
+        if (node.property.name !== "meta") {
+          this.raiseRecoverable(node.property.start, "The only valid meta property for import is import.meta")
+        }
+        return this.finishNode(node, "MetaProperty")
+      }
+    })
+
+    instance.extend("parseStatement", function (superF) {
+      return function(declaration, topLevel, exports) {
+        if (this.type !== tt._import) { return superF.call(this, declaration, topLevel, exports) }
+        if (!nextTokenIsDot(this)) { return superF.call(this, declaration, topLevel, exports) }
+
+        var node = this.startNode()
+        var expr = this.parseExpression()
+        return this.parseExpressionStatement(node, expr)
+      }
+    })
+  }
+  return acorn
+}

package.json

@@ -12,6 +12,7 @@
     "xtend": "^4.0.1"
   },
   "devDependencies": {
+    "acorn-import-meta": "^0.2.1",
     "buble": "^0.18.0",
     "mkdirp": "^0.5.1",
     "standard": "^10.0.3",