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MIT License
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Copyright (c) 2014-present Sebastian McKenzie and other contributors
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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# @babel/plugin-transform-template-literals
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> Compile ES2015 template literals to ES5
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See our website [@babel/plugin-transform-template-literals](https://babeljs.io/docs/babel-plugin-transform-template-literals) for more information.
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## Install
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Using npm:
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```sh
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npm install --save-dev @babel/plugin-transform-template-literals
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```
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or using yarn:
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```sh
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yarn add @babel/plugin-transform-template-literals --dev
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```
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = void 0;
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var _helperPluginUtils = require("@babel/helper-plugin-utils");
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var _core = require("@babel/core");
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var _default = exports.default = (0, _helperPluginUtils.declare)((api, options) => {
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var _api$assumption, _api$assumption2;
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api.assertVersion(7);
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const ignoreToPrimitiveHint = (_api$assumption = api.assumption("ignoreToPrimitiveHint")) != null ? _api$assumption : options.loose;
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const mutableTemplateObject = (_api$assumption2 = api.assumption("mutableTemplateObject")) != null ? _api$assumption2 : options.loose;
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let helperName = "taggedTemplateLiteral";
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if (mutableTemplateObject) helperName += "Loose";
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function buildConcatCallExpressions(items) {
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let avail = true;
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return items.reduce(function (left, right) {
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let canBeInserted = _core.types.isLiteral(right);
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if (!canBeInserted && avail) {
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canBeInserted = true;
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avail = false;
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}
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if (canBeInserted && _core.types.isCallExpression(left)) {
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left.arguments.push(right);
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return left;
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}
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return _core.types.callExpression(_core.types.memberExpression(left, _core.types.identifier("concat")), [right]);
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});
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}
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return {
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name: "transform-template-literals",
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visitor: {
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TaggedTemplateExpression(path) {
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const {
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node
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} = path;
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const {
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quasi
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} = node;
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const strings = [];
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const raws = [];
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let isStringsRawEqual = true;
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for (const elem of quasi.quasis) {
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const {
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raw,
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cooked
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} = elem.value;
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const value = cooked == null ? path.scope.buildUndefinedNode() : _core.types.stringLiteral(cooked);
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strings.push(value);
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raws.push(_core.types.stringLiteral(raw));
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if (raw !== cooked) {
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isStringsRawEqual = false;
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}
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}
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const helperArgs = [_core.types.arrayExpression(strings)];
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if (!isStringsRawEqual) {
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helperArgs.push(_core.types.arrayExpression(raws));
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}
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const tmp = path.scope.generateUidIdentifier("templateObject");
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path.scope.getProgramParent().push({
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id: _core.types.cloneNode(tmp)
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});
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path.replaceWith(_core.types.callExpression(node.tag, [_core.template.expression.ast`
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${_core.types.cloneNode(tmp)} || (
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${tmp} = ${this.addHelper(helperName)}(${helperArgs})
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)
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`, ...quasi.expressions]));
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},
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TemplateLiteral(path) {
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if (path.parent.type === "TSLiteralType") {
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return;
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}
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const nodes = [];
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const expressions = path.get("expressions");
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let index = 0;
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for (const elem of path.node.quasis) {
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if (elem.value.cooked) {
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nodes.push(_core.types.stringLiteral(elem.value.cooked));
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}
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if (index < expressions.length) {
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const expr = expressions[index++];
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const node = expr.node;
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if (!_core.types.isStringLiteral(node, {
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value: ""
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})) {
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nodes.push(node);
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}
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}
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}
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if (!_core.types.isStringLiteral(nodes[0]) && !(ignoreToPrimitiveHint && _core.types.isStringLiteral(nodes[1]))) {
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nodes.unshift(_core.types.stringLiteral(""));
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}
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let root = nodes[0];
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if (ignoreToPrimitiveHint) {
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for (let i = 1; i < nodes.length; i++) {
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root = _core.types.binaryExpression("+", root, nodes[i]);
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}
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} else if (nodes.length > 1) {
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root = buildConcatCallExpressions(nodes);
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}
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path.replaceWith(root);
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}
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}
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};
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});
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//# sourceMappingURL=index.js.map
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{"version":3,"names":["_helperPluginUtils","require","_core","_default","exports","default","declare","api","options","_api$assumption","_api$assumption2","assertVersion","ignoreToPrimitiveHint","assumption","loose","mutableTemplateObject","helperName","buildConcatCallExpressions","items","avail","reduce","left","right","canBeInserted","t","isLiteral","isCallExpression","arguments","push","callExpression","memberExpression","identifier","name","visitor","TaggedTemplateExpression","path","node","quasi","strings","raws","isStringsRawEqual","elem","quasis","raw","cooked","value","scope","buildUndefinedNode","stringLiteral","helperArgs","arrayExpression","tmp","generateUidIdentifier","getProgramParent","id","cloneNode","replaceWith","tag","template","expression","ast","addHelper","expressions","TemplateLiteral","parent","type","nodes","get","index","length","expr","isStringLiteral","unshift","root","i","binaryExpression"],"sources":["../src/index.ts"],"sourcesContent":["import { declare } from \"@babel/helper-plugin-utils\";\nimport { template, types as t, type NodePath } from \"@babel/core\";\n\nexport interface Options {\n loose?: boolean;\n}\n\nexport default declare((api, options: Options) => {\n api.assertVersion(REQUIRED_VERSION(7));\n\n const ignoreToPrimitiveHint =\n api.assumption(\"ignoreToPrimitiveHint\") ?? options.loose;\n const mutableTemplateObject =\n api.assumption(\"mutableTemplateObject\") ?? options.loose;\n\n let helperName = \"taggedTemplateLiteral\";\n if (mutableTemplateObject) helperName += \"Loose\";\n\n /**\n * This function groups the objects into multiple calls to `.concat()` in\n * order to preserve execution order of the primitive conversion, e.g.\n *\n * \"\".concat(obj.foo, \"foo\", obj2.foo, \"foo2\")\n *\n * would evaluate both member expressions _first_ then, `concat` will\n * convert each one to a primitive, whereas\n *\n * \"\".concat(obj.foo, \"foo\").concat(obj2.foo, \"foo2\")\n *\n * would evaluate the member, then convert it to a primitive, then evaluate\n * the second member and convert that one, which reflects the spec behavior\n * of template literals.\n */\n function buildConcatCallExpressions(items: t.Expression[]): t.CallExpression {\n let avail = true;\n // @ts-expect-error items must not be empty\n return items.reduce(function (left, right) {\n let canBeInserted = t.isLiteral(right);\n\n if (!canBeInserted && avail) {\n canBeInserted = true;\n avail = false;\n }\n if (canBeInserted && t.isCallExpression(left)) {\n left.arguments.push(right);\n return left;\n }\n return t.callExpression(\n t.memberExpression(left, t.identifier(\"concat\")),\n [right],\n );\n });\n }\n\n return {\n name: \"transform-template-literals\",\n\n visitor: {\n TaggedTemplateExpression(path) {\n const { node } = path;\n const { quasi } = node;\n\n const strings = [];\n const raws = [];\n\n // Flag variable to check if contents of strings and raw are equal\n let isStringsRawEqual = true;\n\n for (const elem of quasi.quasis) {\n const { raw, cooked } = elem.value;\n const value =\n cooked == null\n ? path.scope.buildUndefinedNode()\n : t.stringLiteral(cooked);\n\n strings.push(value);\n raws.push(t.stringLiteral(raw));\n\n if (raw !== cooked) {\n // false even if one of raw and cooked are not equal\n isStringsRawEqual = false;\n }\n }\n\n const helperArgs = [t.arrayExpression(strings)];\n // only add raw arrayExpression if there is any difference between raws and strings\n if (!isStringsRawEqual) {\n helperArgs.push(t.arrayExpression(raws));\n }\n\n const tmp = path.scope.generateUidIdentifier(\"templateObject\");\n path.scope.getProgramParent().push({ id: t.cloneNode(tmp) });\n\n path.replaceWith(\n t.callExpression(node.tag, [\n template.expression.ast`\n ${t.cloneNode(tmp)} || (\n ${tmp} = ${this.addHelper(helperName)}(${helperArgs})\n )\n `,\n // @ts-expect-error Fixme: quasi.expressions may contain TSAnyKeyword\n ...quasi.expressions,\n ]),\n );\n },\n\n TemplateLiteral(path) {\n if (path.parent.type === \"TSLiteralType\") {\n // Skip TemplateLiteral in TSLiteralType\n return;\n }\n const nodes: t.Expression[] = [];\n const expressions = path.get(\"expressions\") as NodePath<t.Expression>[];\n\n let index = 0;\n for (const elem of path.node.quasis) {\n if (elem.value.cooked) {\n nodes.push(t.stringLiteral(elem.value.cooked));\n }\n\n if (index < expressions.length) {\n const expr = expressionLine truncated
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Generated
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+34
@@ -0,0 +1,34 @@
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{
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"name": "@babel/plugin-transform-template-literals",
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"version": "7.29.7",
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"description": "Compile ES2015 template literals to ES5",
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"repository": {
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"type": "git",
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"url": "https://github.com/babel/babel.git",
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"directory": "packages/babel-plugin-transform-template-literals"
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},
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"license": "MIT",
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"publishConfig": {
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"access": "public"
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},
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"main": "./lib/index.js",
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"dependencies": {
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"@babel/helper-plugin-utils": "^7.29.7"
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},
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"keywords": [
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"babel-plugin"
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],
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"peerDependencies": {
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"@babel/core": "^7.0.0-0"
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},
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"devDependencies": {
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"@babel/core": "^7.29.7",
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"@babel/helper-plugin-test-runner": "^7.29.7"
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},
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"homepage": "https://babel.dev/docs/en/next/babel-plugin-transform-template-literals",
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"engines": {
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"node": ">=6.9.0"
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},
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"author": "The Babel Team (https://babel.dev/team)",
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"type": "commonjs"
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}
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