78 lines
2.3 KiB
JavaScript
78 lines
2.3 KiB
JavaScript
"use strict";
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var traverse = require("../../traverse");
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var util = require("../../util");
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var core = require("core-js/library");
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var t = require("../../types");
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var _ = require("lodash");
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var coreHas = function (node) {
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return node.name !== "_" && _.has(core, node.name);
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};
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var ALIASABLE_CONSTRUCTORS = [
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"Symbol",
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"Promise",
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"Map",
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"WeakMap",
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"Set",
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"WeakSet"
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];
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exports.optional = true;
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exports.ast = {
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enter: function (ast, file) {
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file.opts.runtime = file.addImport("6to5-runtime/helpers", "to5Runtime").name;
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file._coreId = file.addImport("6to5-runtime/core-js", "core");
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file._regeneratorId = file.addImport("6to5-runtime/regenerator", "regeneratorRuntime");
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},
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exit: function (ast, file) {
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traverse(ast, {
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enter: function (node, parent, scope, context) {
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var prop;
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if (t.isMemberExpression(node) && t.isReferenced(node, parent)) {
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// Array.from -> _core.Array.from
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var obj = node.object;
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prop = node.property;
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if (!t.isReferenced(obj, node)) return;
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if (!node.computed && coreHas(obj) && _.has(core[obj.name], prop.name)) {
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context.skip();
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return t.prependToMemberExpression(node, file._coreId);
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}
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} else if (t.isIdentifier(node) && !t.isMemberExpression(parent) && t.isReferenced(node, parent) && _.contains(ALIASABLE_CONSTRUCTORS, node.name)) {
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// Symbol() -> _core.Symbol(); new Promise -> new _core.Promise
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return t.memberExpression(file._coreId, node);
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} else if (t.isCallExpression(node)) {
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// arr[Symbol.iterator]() -> _core.$for.getIterator(arr)
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if (node.arguments.length) return;
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var callee = node.callee;
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if (!t.isMemberExpression(callee)) return;
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if (!callee.computed) return;
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prop = callee.property;
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if (!t.isIdentifier(prop.object, { name: "Symbol" })) return;
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if (!t.isIdentifier(prop.property, { name: "iterator" })) return;
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return util.template("corejs-iterator", {
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CORE_ID: file._coreId,
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VALUE: callee.object
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});
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}
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}
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});
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}
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};
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exports.Identifier = function (node, parent, scope, context, file) {
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if (node.name === "regeneratorRuntime" && t.isReferenced(node, parent)) {
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node.name = file._regeneratorId;
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}
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};
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