74 lines
2.2 KiB
JavaScript
74 lines
2.2 KiB
JavaScript
import { declare } from "@babel/helper-plugin-utils";
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import { types as t } from "@babel/core";
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function getName(key) {
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if (t.isIdentifier(key)) {
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return key.name;
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}
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return key.value.toString();
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}
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export default declare(api => {
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api.assertVersion(7);
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return {
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name: "transform-duplicate-keys",
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visitor: {
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ObjectExpression(path) {
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const { node } = path;
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const plainProps = node.properties.filter(
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prop => !t.isSpreadElement(prop) && !prop.computed,
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);
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// A property is a duplicate key if:
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// * the property is a data property, and is preceded by a data,
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// getter, or setter property of the same name.
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// * the property is a getter property, and is preceded by a data or
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// getter property of the same name.
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// * the property is a setter property, and is preceded by a data or
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// setter property of the same name.
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const alreadySeenData = Object.create(null);
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const alreadySeenGetters = Object.create(null);
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const alreadySeenSetters = Object.create(null);
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for (const prop of plainProps) {
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const name = getName(prop.key);
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let isDuplicate = false;
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switch (prop.kind) {
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case "get":
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if (alreadySeenData[name] || alreadySeenGetters[name]) {
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isDuplicate = true;
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}
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alreadySeenGetters[name] = true;
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break;
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case "set":
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if (alreadySeenData[name] || alreadySeenSetters[name]) {
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isDuplicate = true;
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}
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alreadySeenSetters[name] = true;
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break;
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default:
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if (
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alreadySeenData[name] ||
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alreadySeenGetters[name] ||
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alreadySeenSetters[name]
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) {
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isDuplicate = true;
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}
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alreadySeenData[name] = true;
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}
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if (isDuplicate) {
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// Rely on the computed properties transform to split the property
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// assignment out of the object literal.
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prop.computed = true;
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prop.key = t.stringLiteral(name);
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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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