flutter 使用source_gen和code_builder编译时生成代码

if (element is! ClassElement) {
throw InvalidGenerationSourceError(‘ChannelHelper只能用在类上’);
}
className = element.displayName;
var channelName = annotation.peek(“channelName”).stringValue;
ClassBuilder classBuilder;

var channelHelper = Class((builder) {
classBuilder = builder;

classBuilder.constructors.add(Constructor((constructorBuild) {
constructorBuild.name = “_internal”;
}));

classBuilder.name = 'KaTeX parse error: Expected '}', got 'EOF' at end of input: …dModifier.final;
fieldBuild.assignment = Code(‘MethodChannel(“$channelName”)’);
}));

classBuilder.fields.add(Field((fieldBuild) {
fieldBuild.name = “_$cl$

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