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- "use strict";
- exports.__esModule = true;
- exports.default = void 0;
- /**
- * Converts destructured parameters with default values to non-shorthand syntax.
- * This fixes the only Tagged Templates-related bug in ES Modules-supporting browsers (Safari 10 & 11).
- * Use this plugin instead of `@babel/plugin-transform-template-literals` when targeting ES Modules.
- *
- * @example
- * // Bug 1: Safari 10/11 doesn't reliably return the same Strings value.
- * // The value changes depending on invocation and function optimization state.
- * function f() { return Object`` }
- * f() === new f() // false, should be true.
- *
- * @example
- * // Bug 2: Safari 10/11 use the same cached strings value when the string parts are the same.
- * // This behavior comes from an earlier version of the spec, and can cause tricky bugs.
- * Object``===Object`` // true, should be false.
- *
- * Benchmarks: https://jsperf.com/compiled-tagged-template-performance
- */
- var _default = ({
- types: t
- }) => ({
- name: "transform-tagged-template-caching",
- visitor: {
- TaggedTemplateExpression(path, state) {
- // tagged templates we've already dealt with
- let processed = state.get("processed");
- if (!processed) {
- processed = new WeakSet();
- state.set("processed", processed);
- }
- if (processed.has(path.node)) return path.skip(); // Grab the expressions from the original tag.
- // tag`a${'hello'}` // ['hello']
- const expressions = path.node.quasi.expressions; // Create an identity function helper:
- // identity = t => t
- let identity = state.get("identity");
- if (!identity) {
- identity = path.scope.getProgramParent().generateDeclaredUidIdentifier("_");
- state.set("identity", identity);
- const binding = path.scope.getBinding(identity.name);
- binding.path.get("init").replaceWith(t.arrowFunctionExpression( // re-use the helper identifier for compressability
- [t.identifier("t")], t.identifier("t")));
- } // Use the identity function helper to get a reference to the template's Strings.
- // We replace all expressions with `0` ensure Strings has the same shape.
- // identity`a${0}`
- const template = t.taggedTemplateExpression(t.cloneNode(identity), t.templateLiteral(path.node.quasi.quasis, expressions.map(() => t.numericLiteral(0))));
- processed.add(template); // Install an inline cache at the callsite using the global variable:
- // _t || (_t = identity`a${0}`)
- const ident = path.scope.getProgramParent().generateDeclaredUidIdentifier("t");
- path.scope.getBinding(ident.name).path.parent.kind = "let";
- const inlineCache = t.logicalExpression("||", ident, t.assignmentExpression("=", t.cloneNode(ident), template)); // The original tag function becomes a plain function call.
- // The expressions omitted from the cached Strings tag are directly applied as arguments.
- // tag(_t || (_t = Object`a${0}`), 'hello')
- const node = t.callExpression(path.node.tag, [inlineCache, ...expressions]);
- path.replaceWith(node);
- }
- }
- });
- exports.default = _default;
- module.exports = exports.default;
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