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ImportParserPlugin.js
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Sat, Mar 15, 23:41

ImportParserPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const AsyncDependenciesBlock = require("../AsyncDependenciesBlock");
const CommentCompilationWarning = require("../CommentCompilationWarning");
const UnsupportedFeatureWarning = require("../UnsupportedFeatureWarning");
const ContextDependencyHelpers = require("./ContextDependencyHelpers");
const ImportContextDependency = require("./ImportContextDependency");
const ImportDependency = require("./ImportDependency");
const ImportEagerDependency = require("./ImportEagerDependency");
const ImportWeakDependency = require("./ImportWeakDependency");
/** @typedef {import("../ChunkGroup").RawChunkGroupOptions} RawChunkGroupOptions */
/** @typedef {import("../ContextModule").ContextMode} ContextMode */
class ImportParserPlugin {
constructor(options) {
this.options = options;
}
apply(parser) {
parser.hooks.importCall.tap("ImportParserPlugin", expr => {
const param = parser.evaluateExpression(expr.source);
let chunkName = null;
/** @type {ContextMode} */
let mode = "lazy";
let include = null;
let exclude = null;
/** @type {string[][] | null} */
let exports = null;
/** @type {RawChunkGroupOptions} */
const groupOptions = {};
const {
options: importOptions,
errors: commentErrors
} = parser.parseCommentOptions(expr.range);
if (commentErrors) {
for (const e of commentErrors) {
const { comment } = e;
parser.state.module.addWarning(
new CommentCompilationWarning(
`Compilation error while processing magic comment(-s): /*${comment.value}*/: ${e.message}`,
comment.loc
)
);
}
}
if (importOptions) {
if (importOptions.webpackIgnore !== undefined) {
if (typeof importOptions.webpackIgnore !== "boolean") {
parser.state.module.addWarning(
new UnsupportedFeatureWarning(
`\`webpackIgnore\` expected a boolean, but received: ${importOptions.webpackIgnore}.`,
expr.loc
)
);
} else {
// Do not instrument `import()` if `webpackIgnore` is `true`
if (importOptions.webpackIgnore) {
return false;
}
}
}
if (importOptions.webpackChunkName !== undefined) {
if (typeof importOptions.webpackChunkName !== "string") {
parser.state.module.addWarning(
new UnsupportedFeatureWarning(
`\`webpackChunkName\` expected a string, but received: ${importOptions.webpackChunkName}.`,
expr.loc
)
);
} else {
chunkName = importOptions.webpackChunkName;
}
}
if (importOptions.webpackMode !== undefined) {
if (typeof importOptions.webpackMode !== "string") {
parser.state.module.addWarning(
new UnsupportedFeatureWarning(
`\`webpackMode\` expected a string, but received: ${importOptions.webpackMode}.`,
expr.loc
)
);
} else {
mode = importOptions.webpackMode;
}
}
if (importOptions.webpackPrefetch !== undefined) {
if (importOptions.webpackPrefetch === true) {
groupOptions.prefetchOrder = 0;
} else if (typeof importOptions.webpackPrefetch === "number") {
groupOptions.prefetchOrder = importOptions.webpackPrefetch;
} else {
parser.state.module.addWarning(
new UnsupportedFeatureWarning(
`\`webpackPrefetch\` expected true or a number, but received: ${importOptions.webpackPrefetch}.`,
expr.loc
)
);
}
}
if (importOptions.webpackPreload !== undefined) {
if (importOptions.webpackPreload === true) {
groupOptions.preloadOrder = 0;
} else if (typeof importOptions.webpackPreload === "number") {
groupOptions.preloadOrder = importOptions.webpackPreload;
} else {
parser.state.module.addWarning(
new UnsupportedFeatureWarning(
`\`webpackPreload\` expected true or a number, but received: ${importOptions.webpackPreload}.`,
expr.loc
)
);
}
}
if (importOptions.webpackInclude !== undefined) {
if (
!importOptions.webpackInclude ||
importOptions.webpackInclude.constructor.name !== "RegExp"
) {
parser.state.module.addWarning(
new UnsupportedFeatureWarning(
`\`webpackInclude\` expected a regular expression, but received: ${importOptions.webpackInclude}.`,
expr.loc
)
);
} else {
include = new RegExp(importOptions.webpackInclude);
}
}
if (importOptions.webpackExclude !== undefined) {
if (
!importOptions.webpackExclude ||
importOptions.webpackExclude.constructor.name !== "RegExp"
) {
parser.state.module.addWarning(
new UnsupportedFeatureWarning(
`\`webpackExclude\` expected a regular expression, but received: ${importOptions.webpackExclude}.`,
expr.loc
)
);
} else {
exclude = new RegExp(importOptions.webpackExclude);
}
}
if (importOptions.webpackExports !== undefined) {
if (
!(
typeof importOptions.webpackExports === "string" ||
(Array.isArray(importOptions.webpackExports) &&
importOptions.webpackExports.every(
item => typeof item === "string"
))
)
) {
parser.state.module.addWarning(
new UnsupportedFeatureWarning(
`\`webpackExports\` expected a string or an array of strings, but received: ${importOptions.webpackExports}.`,
expr.loc
)
);
} else {
if (typeof importOptions.webpackExports === "string") {
exports = [[importOptions.webpackExports]];
} else {
exports = Array.from(importOptions.webpackExports, e => [e]);
}
}
}
}
if (param.isString()) {
if (mode !== "lazy" && mode !== "eager" && mode !== "weak") {
parser.state.module.addWarning(
new UnsupportedFeatureWarning(
`\`webpackMode\` expected 'lazy', 'eager' or 'weak', but received: ${mode}.`,
expr.loc
)
);
}
if (mode === "eager") {
const dep = new ImportEagerDependency(
param.string,
expr.range,
exports
);
parser.state.current.addDependency(dep);
} else if (mode === "weak") {
const dep = new ImportWeakDependency(
param.string,
expr.range,
exports
);
parser.state.current.addDependency(dep);
} else {
const depBlock = new AsyncDependenciesBlock(
{
...groupOptions,
name: chunkName
},
expr.loc,
param.string
);
const dep = new ImportDependency(param.string, expr.range, exports);
dep.loc = expr.loc;
depBlock.addDependency(dep);
parser.state.current.addBlock(depBlock);
}
return true;
} else {
if (
mode !== "lazy" &&
mode !== "lazy-once" &&
mode !== "eager" &&
mode !== "weak"
) {
parser.state.module.addWarning(
new UnsupportedFeatureWarning(
`\`webpackMode\` expected 'lazy', 'lazy-once', 'eager' or 'weak', but received: ${mode}.`,
expr.loc
)
);
mode = "lazy";
}
if (mode === "weak") {
mode = "async-weak";
}
const dep = ContextDependencyHelpers.create(
ImportContextDependency,
expr.range,
param,
expr,
this.options,
{
chunkName,
groupOptions,
include,
exclude,
mode,
namespaceObject: parser.state.module.buildMeta.strictHarmonyModule
? "strict"
: true,
category: "esm",
referencedExports: exports
},
parser
);
if (!dep) return;
dep.loc = expr.loc;
dep.optional = !!parser.scope.inTry;
parser.state.current.addDependency(dep);
return true;
}
});
}
}
module.exports = ImportParserPlugin;

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