feat(logger): implement logger utility

src/index.ts

@@ -0,0 +1 @@
+export { log, enableLogger } from './util/logger';

src/util/logger.ts

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+import { enableLogger as emscriptenEnableLogger } from 'emscripten-wasm-loader';
+type logFunctionType = (message: string, ...optionalParams: Array<any>) => void;
+/**
+ * Default log instance falls back to noop if not specified.
+ */
+let logInstance: logFunctionType = () => {
+  /* noop */
+};
+
+const log: logFunctionType = (...args: Array<any>) => (logInstance as any)(...args);
+
+/**
+ * Enables logging internal behavior of libsass-asm.
+ * @param logger function to log.
+ */
+const enableLogger = (logger: logFunctionType) => {
+  const scopedLogger = (scope: string) => (message: string, ...optionalParams: Array<any>) => {
+    logger(`${scope}::${message}`, ...optionalParams);
+  };
+
+  logInstance = scopedLogger(`libsass`);
+  emscriptenEnableLogger(scopedLogger(`libsassLoader`));
+};
+
+export { enableLogger, logFunctionType, log };