/
index.ts
158 lines (141 loc) 路 3.95 KB
/
index.ts
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import type { NodePath } from "@babel/traverse";
import nameFunction from "@babel/helper-function-name";
import template from "@babel/template";
import {
blockStatement,
callExpression,
functionExpression,
isAssignmentPattern,
isRestElement,
returnStatement,
} from "@babel/types";
import type * as t from "@babel/types";
const buildAnonymousExpressionWrapper = template.expression(`
(function () {
var REF = FUNCTION;
return function NAME(PARAMS) {
return REF.apply(this, arguments);
};
})()
`);
const buildNamedExpressionWrapper = template.expression(`
(function () {
var REF = FUNCTION;
function NAME(PARAMS) {
return REF.apply(this, arguments);
}
return NAME;
})()
`);
const buildDeclarationWrapper = template(`
function NAME(PARAMS) { return REF.apply(this, arguments); }
function REF() {
REF = FUNCTION;
return REF.apply(this, arguments);
}
`);
function classOrObjectMethod(
path: NodePath<t.ClassMethod | t.ClassPrivateMethod | t.ObjectMethod>,
callId: any,
) {
const node = path.node;
const body = node.body;
const container = functionExpression(
null,
[],
blockStatement(body.body),
true,
);
body.body = [
returnStatement(callExpression(callExpression(callId, [container]), [])),
];
// Regardless of whether or not the wrapped function is a an async method
// or generator the outer function should not be
node.async = false;
node.generator = false;
// Unwrap the wrapper IIFE's environment so super and this and such still work.
(
path.get("body.body.0.argument.callee.arguments.0") as NodePath
).unwrapFunctionEnvironment();
}
function plainFunction(
path: NodePath<any>,
callId: any,
noNewArrows: boolean,
ignoreFunctionLength: boolean,
) {
const node = path.node;
const isDeclaration = path.isFunctionDeclaration();
const functionId = node.id;
const wrapper = isDeclaration
? buildDeclarationWrapper
: functionId
? buildNamedExpressionWrapper
: buildAnonymousExpressionWrapper;
if (path.isArrowFunctionExpression()) {
path.arrowFunctionToExpression({ noNewArrows });
}
node.id = null;
if (isDeclaration) {
node.type = "FunctionExpression";
}
const built = callExpression(callId, [node]);
const params = node.params.reduce(
(acc, param) => {
acc.done = acc.done || isAssignmentPattern(param) || isRestElement(param);
if (!acc.done) {
acc.params.push(path.scope.generateUidIdentifier("x"));
}
return acc;
},
{
params: [],
done: false,
},
).params;
const container = wrapper({
NAME: functionId || null,
REF: path.scope.generateUidIdentifier(functionId ? functionId.name : "ref"),
FUNCTION: built,
PARAMS: params,
});
if (isDeclaration) {
path.replaceWith(container[0]);
path.insertAfter(container[1]);
} else {
// @ts-expect-error todo(flow->ts) separate `wrapper` for `isDeclaration` and `else` branches
const retFunction = container.callee.body.body[1].argument;
if (!functionId) {
nameFunction({
node: retFunction,
parent: path.parent,
scope: path.scope,
});
}
if (
!retFunction ||
retFunction.id ||
(!ignoreFunctionLength && params.length)
) {
// we have an inferred function id or params so we need this wrapper
// @ts-expect-error todo(flow->ts) separate `wrapper` for `isDeclaration` and `else` branches
path.replaceWith(container);
} else {
// we can omit this wrapper as the conditions it protects for do not apply
path.replaceWith(built);
}
}
}
export default function wrapFunction(
path: NodePath,
callId: any,
// TODO(Babel 8): Consider defaulting to false for spec compliancy
noNewArrows: boolean = true,
ignoreFunctionLength: boolean = false,
) {
if (path.isMethod()) {
classOrObjectMethod(path, callId);
} else {
plainFunction(path, callId, noNewArrows, ignoreFunctionLength);
}
}