/
index.js
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index.js
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import { declare } from "@babel/helper-plugin-utils";
import syntaxFlow from "@babel/plugin-syntax-flow";
import { types as t } from "@babel/core";
export default declare(api => {
api.assertVersion(7);
function wrapInFlowComment(path, parent) {
let attach = path.getPrevSibling();
let where = "trailing";
if (!attach.node) {
attach = path.parentPath;
where = "inner";
}
attach.addComment(where, generateComment(path, parent));
path.remove();
}
function generateComment(path, parent) {
let comment = path
.getSource()
.replace(/\*-\//g, "*-ESCAPED/")
.replace(/\*\//g, "*-/");
if (parent && parent.optional) comment = "?" + comment;
if (comment[0] !== ":") comment = ":: " + comment;
return comment;
}
return {
name: "transform-flow-comments",
inherits: syntaxFlow,
visitor: {
TypeCastExpression(path) {
const { node } = path;
path
.get("expression")
.addComment("trailing", generateComment(path.get("typeAnnotation")));
path.replaceWith(t.parenthesizedExpression(node.expression));
},
// support function a(b?) {}
Identifier(path) {
if (path.parentPath.isFlow()) {
return;
}
const { node } = path;
if (node.typeAnnotation) {
const typeAnnotation = path.get("typeAnnotation");
path.addComment("trailing", generateComment(typeAnnotation, node));
typeAnnotation.remove();
if (node.optional) {
node.optional = false;
}
} else if (node.optional) {
path.addComment("trailing", ":: ?");
node.optional = false;
}
},
AssignmentPattern: {
exit({ node }) {
const { left } = node;
if (left.optional) {
left.optional = false;
}
},
},
// strip optional property from function params - facebook/fbjs#17
Function(path) {
if (path.isDeclareFunction()) return;
const { node } = path;
if (node.returnType) {
const returnType = path.get("returnType");
const typeAnnotation = returnType.get("typeAnnotation");
const block = path.get("body");
block.addComment(
"leading",
generateComment(returnType, typeAnnotation.node),
);
returnType.remove();
}
if (node.typeParameters) {
const typeParameters = path.get("typeParameters");
const id = path.get("id");
id.addComment(
"trailing",
generateComment(typeParameters, typeParameters.node),
);
typeParameters.remove();
}
},
// support for `class X { foo: string }` - #4622
ClassProperty(path) {
const { node, parent } = path;
if (!node.value) {
wrapInFlowComment(path, parent);
} else if (node.typeAnnotation) {
const typeAnnotation = path.get("typeAnnotation");
path
.get("key")
.addComment(
"trailing",
generateComment(typeAnnotation, typeAnnotation.node),
);
typeAnnotation.remove();
}
},
// support `export type a = {}` - #8 Error: You passed path.replaceWith() a falsy node
ExportNamedDeclaration(path) {
const { node, parent } = path;
if (node.exportKind !== "type" && !t.isFlow(node.declaration)) {
return;
}
wrapInFlowComment(path, parent);
},
// support `import type A` and `import typeof A` #10
ImportDeclaration(path) {
const { node, parent } = path;
if (node.importKind !== "type" && node.importKind !== "typeof") {
return;
}
wrapInFlowComment(path, parent);
},
ObjectPattern(path) {
const { node } = path;
if (node.typeAnnotation) {
const typeAnnotation = path.get("typeAnnotation");
path.addComment(
"trailing",
generateComment(typeAnnotation, typeAnnotation.node),
);
typeAnnotation.remove();
}
},
Flow(path) {
const { parent } = path;
wrapInFlowComment(path, parent);
},
Class(path) {
const { node } = path;
if (node.typeParameters) {
const typeParameters = path.get("typeParameters");
const block = path.get("body");
block.addComment(
"leading",
generateComment(typeParameters, typeParameters.node),
);
typeParameters.remove();
}
},
},
};
});