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methods.js
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methods.js
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import * as t from "babel-types";
export function _params(node: Object) {
this.print(node.typeParameters, node);
this.token("(");
this.printList(node.params, node, {
iterator: (node) => {
if (node.optional) this.token("?");
this.print(node.typeAnnotation, node);
}
});
this.token(")");
if (node.returnType) {
this.print(node.returnType, node);
}
}
export function _method(node: Object) {
let kind = node.kind;
let key = node.key;
if (kind === "method" || kind === "init") {
if (node.generator) {
this.token("*");
}
}
if (kind === "get" || kind === "set") {
this.word(kind);
this.space();
}
if (node.async) {
this.word("async");
this.space();
}
if (node.computed) {
this.token("[");
this.print(key, node);
this.token("]");
} else {
this.print(key, node);
}
this._params(node);
this.space();
this.print(node.body, node);
}
export function FunctionExpression(node: Object) {
if (node.async) {
this.word("async");
this.space();
}
this.word("function");
if (node.generator) this.token("*");
if (node.id) {
this.space();
this.print(node.id, node);
} else {
this.space();
}
this._params(node);
this.space();
this.print(node.body, node);
}
export { FunctionExpression as FunctionDeclaration };
export function ArrowFunctionExpression(node: Object) {
if (node.async) {
this.word("async");
this.space();
}
const firstParam = node.params[0];
if (node.params.length === 1 && t.isIdentifier(firstParam) && !hasTypes(node, firstParam)) {
this.print(firstParam, node);
} else {
this._params(node);
}
this.space();
this.token("=>");
this.space();
this.print(node.body, node);
}
function hasTypes(node, param) {
return node.typeParameters || node.returnType || param.typeAnnotation || param.optional || param.trailingComments;
}