65 lines
1.7 KiB
JavaScript
65 lines
1.7 KiB
JavaScript
import { declare } from "@babel/helper-plugin-utils";
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import syntaxFunctionSent from "@babel/plugin-syntax-function-sent";
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import wrapFunction from "@babel/helper-wrap-function";
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import { types as t } from "@babel/core";
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export default declare(api => {
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api.assertVersion(7);
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const isFunctionSent = node =>
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t.isIdentifier(node.meta, { name: "function" }) &&
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t.isIdentifier(node.property, { name: "sent" });
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const hasBeenReplaced = (node, sentId) =>
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t.isAssignmentExpression(node) &&
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t.isIdentifier(node.left, { name: sentId });
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const yieldVisitor = {
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Function(path) {
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path.skip();
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},
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YieldExpression(path) {
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if (!hasBeenReplaced(path.parent, this.sentId)) {
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path.replaceWith(
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t.assignmentExpression("=", t.identifier(this.sentId), path.node),
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);
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}
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},
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MetaProperty(path) {
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if (isFunctionSent(path.node)) {
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path.replaceWith(t.identifier(this.sentId));
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}
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},
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};
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return {
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name: "proposal-function-sent",
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inherits: syntaxFunctionSent,
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visitor: {
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MetaProperty(path, state) {
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if (!isFunctionSent(path.node)) return;
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const fnPath = path.getFunctionParent();
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if (!fnPath.node.generator) {
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throw new Error("Parent generator function not found");
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}
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const sentId = path.scope.generateUid("function.sent");
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fnPath.traverse(yieldVisitor, { sentId });
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fnPath.node.body.body.unshift(
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t.variableDeclaration("let", [
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t.variableDeclarator(t.identifier(sentId), t.yieldExpression()),
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]),
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);
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wrapFunction(fnPath, state.addHelper("skipFirstGeneratorNext"));
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},
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},
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};
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});
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