This commit is contained in:
Iliyan Angelov
2025-09-14 23:24:25 +03:00
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MIT License
Copyright (c) 2025 Nicolò Ribaudo
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# Support for `import defer` and `import souce` in acorn
## Install
```
npm install acorn-import-phases
```
## Usage
This module provides a plugin that can be used to extend the Acorn Parser class:
```js
const {Parser} = require('acorn');
const importPhases = require('acorn-import-phases');
Parser.extend(importPhases()).parse('...');
```
By default, the plugin supports both `import defer` and `import source` syntax. You can disable one of them by passing an options object:
```js
const {Parser} = require('acorn');
const importPhases = require('acorn-import-phases');
Parser.extend(importPhases({ defer: false })).parse('...');
Parser.extend(importPhases({ source: false })).parse('...');
```
## License
This plugin is released under an MIT License.

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{
"name": "acorn-import-phases",
"version": "1.0.4",
"description": "Support for `import <defer|source>` phase syntax in Acorn",
"type": "module",
"main": "./src/index.cjs",
"types": "./src/index.d.cts",
"exports": {
".": {
"require": {
"types": "./src/index.d.cts",
"default": "./src/index.cjs"
},
"types": "./src/index.d.mts",
"default": "./src/index.js"
},
"./package.json": "./package.json"
},
"scripts": {
"test": "node --test ./test/index.js"
},
"keywords": [
"acorn",
"import",
"defer",
"source",
"phase",
"wasm",
"proposal"
],
"author": "Nicolò Ribaudo",
"repository": {
"type": "git",
"url": "https://github.com/nicolo-ribaudo/acorn-import-phases.git"
},
"license": "MIT",
"devDependencies": {
"acorn": "^8.14.0"
},
"peerDependencies": {
"acorn": "^8.14.0"
},
"engines": {
"node": ">=10.13.0"
}
}

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const { plugin } = require("./plugin.cjs");
module.exports = function (options = {}) {
return (Parser) => plugin(options, Parser, (Parser.acorn || require("acorn")).tokTypes);
};

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import { Parser } from "acorn";
interface Options {
source?: boolean;
defer?: boolean;
}
declare function acornImportPhases(options?: Options): (BaseParser: typeof Parser) => typeof Parser;
export = acornImportPhases;

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import { Parser } from "acorn";
interface Options {
source?: boolean;
defer?: boolean;
}
export default function acornImportPhases(options?: Options): (BaseParser: typeof Parser) => typeof Parser;

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import { tokTypes } from "acorn";
import { plugin } from "./plugin.cjs";
export default function (options = {}) {
return Parser => plugin(options, Parser, Parser.acorn ? Parser.acorn.tokTypes : tokTypes);
}

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/**
* @param {{ defer?: boolean, source?: boolean }} options
* @param {typeof import("acorn").Parser} Parser
* @param {typeof import("acorn").tokTypes} acorn
*/
exports.plugin = function acornImportPhase(options, Parser, tt) {
return class extends Parser {
parseImport(node) {
this._phase = null;
const result = super.parseImport(node);
if (this._phase) {
node.phase = this._phase;
}
return result;
}
parseImportSpecifiers() {
let phase =
options.defer !== false && this.isContextual("defer")
? "defer"
: options.source !== false && this.isContextual("source")
? "source"
: null;
if (!phase) return super.parseImportSpecifiers();
const phaseId = this.parseIdent();
if (this.isContextual("from") || this.type === tt.comma) {
const defaultSpecifier = this.startNodeAt(phaseId.start, phaseId.loc && phaseId.loc.start);
defaultSpecifier.local = phaseId;
this.checkLValSimple(phaseId, /* BIND_LEXICAL */ 2);
const nodes = [this.finishNode(defaultSpecifier, "ImportDefaultSpecifier")];
if (this.eat(tt.comma)) {
if (this.type !== tt.star && this.type !== tt.braceL) {
this.unexpected();
}
nodes.push(...super.parseImportSpecifiers());
}
return nodes;
}
this._phase = phase;
if (phase === "defer") {
if (this.type !== tt.star) {
this.raiseRecoverable(
phaseId.start,
"'import defer' can only be used with namespace imports ('import defer * as identifierName from ...')."
);
}
} else if (phase === "source") {
if (this.type !== tt.name) {
this.raiseRecoverable(
phaseId.start,
"'import source' can only be used with direct identifier specifier imports."
);
}
}
const specifiers = super.parseImportSpecifiers();
if (phase === "source" && specifiers.some(s => s.type !== "ImportDefaultSpecifier")) {
this.raiseRecoverable(
phaseId.start,
`'import source' can only be used with direct identifier specifier imports ('import source identifierName from ...').`
);
}
return specifiers;
}
parseExprImport(forNew) {
const node = super.parseExprImport(forNew);
if (node.type === "MetaProperty" && (node.property.name === "defer" || node.property.name === "source")) {
if (this.type === tt.parenL) {
const dynImport = this.parseDynamicImport(this.startNodeAt(node.start, node.loc && node.loc.start));
dynImport.phase = node.property.name;
return dynImport;
} else {
this.raiseRecoverable(
node.start,
`'import.${node.property.name}' can only be used in a dynamic import.`
);
}
}
return node;
}
parseImportMeta(node) {
this.next();
var containsEsc = this.containsEsc;
node.property = this.parseIdent(true);
const { name } = node.property;
if (name !== "meta" && name !== "defer" && name !== "source") {
this.raiseRecoverable(
node.property.start,
"The only valid meta property for import is 'import.meta'"
);
}
if (containsEsc) {
this.raiseRecoverable(
node.start,
`'import.${name}' must not contain escaped characters`
);
}
if (
name === "meta" &&
this.options.sourceType !== "module" &&
!this.options.allowImportExportEverywhere
) {
this.raiseRecoverable(
node.start,
"Cannot use 'import.meta' outside a module"
);
}
return this.finishNode(node, "MetaProperty");
}
};
};