Function findExpression

packages/compiler/test/render3/view/util.ts:89–104

(tmpl: a.Node[], expr: string)

}

export function findExpression(tmpl: a.Node[], expr: string): e.AST | null {
  const res = tmpl.reduce(
    (found, node) => {
      if (found !== null) {
        return found;
      } else {
        return findExpressionInNode(node, expr);
      }
    },
    null as e.AST | null,
  );
  if (res instanceof e.ASTWithSource) {
    return res.ast;
  }
  return res;
}

function findExpressionInNode(node: a.Node, expr: string): e.AST | null {
  if (node instanceof a.Element || node instanceof a.Template || node instanceof a.Component) {