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ImportParserPlugin.js
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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 UnsupportedFeatureWarning = require("../UnsupportedFeatureWarning");
const commentParser = require("../util/commentParser");
const ContextDependencyHelpers = require("./ContextDependencyHelpers");
const ImportContextDependency = require("./ImportContextDependency");
const ImportDependency = require("./ImportDependency");
const ImportEagerDependency = require("./ImportEagerDependency");
const ImportWeakDependency = require("./ImportWeakDependency");
class ImportParserPlugin {
constructor(options) {
this.options = options;
}
apply(parser) {
parser.hooks.importCall.tap("ImportParserPlugin", expr => {
const param = parser.evaluateExpression(expr.source);
const parsed = commentParser(parser, expr, "lazy", true);
if (!parsed) {
return false;
}
let mode = parsed.mode;
const { chunkName, exports, include, exclude, groupOptions } = parsed;
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,
typePrefix: "import()",
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;