build/lib/mangleTypeScript.ts/ClassData/_getMemberName
class ClassData:	private static _getMemberName(node: ts.NamedDeclaration): string | undefined {
		if (!node.name) {
			return undefined;
		}
		const { name } = node;
		let ident = name.getText();
		if (name.kind === ts.SyntaxKind.ComputedPropertyName) {
			if (name.expression.kind !== ts.SyntaxKind.StringLiteral) {
				// unsupported: [Symbol.foo] or [abc + 'field']
				return;
			}
			// ['foo']
			ident = name.expression.getText().slice(1, -1);
		}

		return ident;
	}