addHelper(name: string): Object {
const declar = this.declarations[name];
if (declar) return declar;
const generator = this.get("helperGenerator");
const runtime = this.get("helpersNamespace");
if (generator) {
const res = generator(name);
if (res) return res;
} else if (runtime) {
return t.memberExpression(runtime, t.identifier(name));
}
const uid = (this.declarations[name] = this.scope.generateUidIdentifier(
name,
));
const dependencies = {};
for (const dep of helpers.getDependencies(name)) {
dependencies[dep] = this.addHelper(dep);
}
const { nodes, globals } = helpers.get(
name,
dep => dependencies[dep],
uid,
Object.keys(this.scope.getAllBindings()),
);
globals.forEach(name => {
if (this.path.scope.hasBinding(name, true /* noGlobals */)) {
this.path.scope.rename(name);
}
});
nodes.forEach(node => {
node._compact = true;
});
this.path.unshiftContainer("body", nodes);
// TODO: NodePath#unshiftContainer should automatically register new
// bindings.
this.path.get("body").forEach(path => {
if (nodes.indexOf(path.node) === -1) return;
if (path.isVariableDeclaration()) this.scope.registerDeclaration(path);
});
return uid;
}
function buildHelper(
runtimeName,
pkgDirname,
helperFilename,
helperName,
{ esm, corejs }
) {
const tree = t.program([], [], esm ? "module" : "script");
const dependencies = {};
let bindings = null;
if (!esm) {
bindings = [];
for (const dep of helpers.getDependencies(helperName)) {
const id = (dependencies[dep] = t.identifier(t.toIdentifier(dep)));
tree.body.push(template.statement.ast`
var ${id} = require("${`./${dep}`}");
`);
bindings.push(id.name);
}
}
const helper = helpers.get(
helperName,
dep => dependencies[dep],
esm ? null : template.expression.ast`module.exports`,
bindings
);
tree.body.push(...helper.nodes);
return babel.transformFromAst(tree, null, {
presets: [[require("@babel/preset-env"), { modules: false }]],
plugins: [
[transformRuntime, { corejs, useESModules: esm }],
buildRuntimeRewritePlugin(
runtimeName,
path.relative(path.dirname(helperFilename), pkgDirname),
helperName
),
],
}).code;
}
function buildHelper(helperName, modules, useBuiltIns) {
const id =
modules === "commonjs"
? t.memberExpression(t.identifier("module"), t.identifier("exports"))
: null;
const sourceType = modules === "commonjs" ? "script" : "module";
const tree = t.program([], [], sourceType);
const dependencies = {};
let bindings = null;
if (modules === "commonjs") {
bindings = [];
for (const dep of helpers.getDependencies(helperName)) {
const id = dependencies[dep] = t.identifier(t.toIdentifier(dep));
tree.body.push(buildRequireCall(id, dep));
bindings.push(id.name);
}
}
const helper = helpers.get(
helperName,
dep => dependencies[dep],
id,
bindings
);
tree.body.push.apply(tree.body, helper.nodes);
const transformOpts = makeTransformOpts(modules, useBuiltIns);
const relative = useBuiltIns ? "../.." : "..";
return babel.transformFromAst(tree, null, {
presets: transformOpts.presets,
plugins: transformOpts.plugins.concat([
buildRuntimeRewritePlugin(
modules === false ? `../${relative}` : relative,
helperName
),
]),
}).code;
}