index.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _helperPluginUtils = require("@babel/helper-plugin-utils");

var _core = require("@babel/core");

var _default = (0, _helperPluginUtils.declare)(api => {
  api.assertVersion(7);
  const surrogate = /[\ud800-\udfff]/g;
  const unicodeEscape = /(\\+)u\{([0-9a-fA-F]+)\}/g;

  function escape(code) {
    let str = code.toString(16);

    while (str.length < 4) str = "0" + str;

    return "\\u" + str;
  }

  function replacer(match, backslashes, code) {
    if (backslashes.length % 2 === 0) {
      return match;
    }

    const char = String.fromCodePoint(parseInt(code, 16));
    const escaped = backslashes.slice(0, -1) + escape(char.charCodeAt(0));
    return char.length === 1 ? escaped : escaped + escape(char.charCodeAt(1));
  }

  function replaceUnicodeEscapes(str) {
    return str.replace(unicodeEscape, replacer);
  }

  function getUnicodeEscape(str) {
    let match;

    while (match = unicodeEscape.exec(str)) {
      if (match[1].length % 2 === 0) continue;
      unicodeEscape.lastIndex = 0;
      return match[0];
    }

    return null;
  }

  return {
    name: "transform-unicode-escapes",

    manipulateOptions({
      generatorOpts
    }) {
      var _generatorOpts$jsescO, _generatorOpts$jsescO2;

      if (!generatorOpts.jsescOption) {
        generatorOpts.jsescOption = {};
      }

      (_generatorOpts$jsescO2 = (_generatorOpts$jsescO = generatorOpts.jsescOption).minimal) != null ? _generatorOpts$jsescO2 : _generatorOpts$jsescO.minimal = false;
    },

    visitor: {
      Identifier(path) {
        const {
          node,
          key
        } = path;
        const {
          name
        } = node;
        const replaced = name.replace(surrogate, c => {
          return `_u${c.charCodeAt(0).toString(16)}`;
        });
        if (name === replaced) return;

        const str = _core.types.inherits(_core.types.stringLiteral(name), node);

        if (key === "key") {
          path.replaceWith(str);
          return;
        }

        const {
          parentPath,
          scope
        } = path;

        if (parentPath.isMemberExpression({
          property: node
        }) || parentPath.isOptionalMemberExpression({
          property: node
        })) {
          parentPath.node.computed = true;
          path.replaceWith(str);
          return;
        }

        const binding = scope.getBinding(name);

        if (binding) {
          scope.rename(name, scope.generateUid(replaced));
          return;
        }

        throw path.buildCodeFrameError(`Can't reference '${name}' as a bare identifier`);
      },

      "StringLiteral|DirectiveLiteral"(path) {
        const {
          node
        } = path;
        const {
          extra
        } = node;
        if (extra != null && extra.raw) extra.raw = replaceUnicodeEscapes(extra.raw);
      },

      TemplateElement(path) {
        const {
          node,
          parentPath
        } = path;
        const {
          value
        } = node;
        const firstEscape = getUnicodeEscape(value.raw);
        if (!firstEscape) return;
        const grandParent = parentPath.parentPath;

        if (grandParent.isTaggedTemplateExpression()) {
          throw path.buildCodeFrameError(`Can't replace Unicode escape '${firstEscape}' inside tagged template literals. You can enable '@babel/plugin-transform-template-literals' to compile them to classic strings.`);
        }

        value.raw = replaceUnicodeEscapes(value.raw);
      }

    }
  };
});

exports.default = _default;