lazy-constructor.ts

import * as d from '../../../declarations';
import { addCreateEvents } from '../create-event';
import { addLegacyProps } from '../legacy-props';
import { REGISTER_INSTANCE, RUNTIME_APIS, addCoreRuntimeApi } from '../core-runtime-apis';
import ts from 'typescript';

export const updateLazyComponentConstructor = (classMembers: ts.ClassElement[], moduleFile: d.Module, cmp: d.ComponentCompilerMeta) => {
  const cstrMethodArgs = [ts.createParameter(undefined, undefined, undefined, ts.createIdentifier(HOST_REF_ARG))];

  const cstrMethodIndex = classMembers.findIndex(m => m.kind === ts.SyntaxKind.Constructor);
  if (cstrMethodIndex >= 0) {
    // add to the existing constructor()
    const cstrMethod = classMembers[cstrMethodIndex] as ts.ConstructorDeclaration;

    const body = ts.updateBlock(cstrMethod.body, [
      registerInstanceStatement(moduleFile),
      ...addCreateEvents(moduleFile, cmp),
      ...cstrMethod.body.statements,
      ...addLegacyProps(moduleFile, cmp),
    ]);

    classMembers[cstrMethodIndex] = ts.updateConstructor(cstrMethod, cstrMethod.decorators, cstrMethod.modifiers, cstrMethodArgs, body);
  } else {
    // create a constructor()
    const cstrMethod = ts.createConstructor(
      undefined,
      undefined,
      cstrMethodArgs,
      ts.createBlock([registerInstanceStatement(moduleFile), ...addCreateEvents(moduleFile, cmp), ...addLegacyProps(moduleFile, cmp)], true),
    );
    classMembers.unshift(cstrMethod);
  }
};

const registerInstanceStatement = (moduleFile: d.Module) => {
  addCoreRuntimeApi(moduleFile, RUNTIME_APIS.registerInstance);

  return ts.createStatement(ts.createCall(ts.createIdentifier(REGISTER_INSTANCE), undefined, [ts.createThis(), ts.createIdentifier(HOST_REF_ARG)]));
};

const HOST_REF_ARG = 'hostRef';