ts-simple-ast: adding stuff to class

const tsSimpleAst = require("ts-simple-ast") const { stripIndent } = require('common-tags') const { default: Project, SyntaxKind, IndentationText, } = tsSimpleAst const project = new Project({useVirtualFileSystem: true, manipulationSettings: { indentationText: IndentationText.TwoSpaces }}) const file = project.createSourceFile(`test.ts`, stripIndent` class Foo { m1 () { } }`) const classDeclaration = file.getFirstDescendantByKindOrThrow(SyntaxKind.ClassDeclaration) const syntaxList = classDeclaration.getFirstDescendantByKindOrThrow(SyntaxKind.SyntaxList) syntaxList.insertChildText(0, writer => { writer.write(`p1 = 1`) }) console.log(file.getFullText())