fix rewriter bin

rewriter/src/error.rs

@@ -0,0 +1,45 @@
+use thiserror::Error;
+use wasm_bindgen::{JsError, JsValue};
+
+#[derive(Debug, Error)]
+pub enum RewriterError {
+	#[error("JS: {0}")]
+	Js(String),
+	#[error("URL parse error: {0}")]
+	Url(#[from] url::ParseError),
+	#[error("str fromutf8 error: {0}")]
+	Str(#[from] std::str::Utf8Error),
+
+	#[error("{0} was not {1}")]
+	Not(String, &'static str),
+	#[error("❗❗❗ ❗❗❗ REWRITER OFFSET OOB FAIL ❗❗❗ ❗❗❗")]
+	Oob,
+}
+
+impl From<JsValue> for RewriterError {
+	fn from(value: JsValue) -> Self {
+		Self::Js(format!("{:?}", value))
+	}
+}
+
+impl From<RewriterError> for JsValue {
+	fn from(value: RewriterError) -> Self {
+		JsError::from(value).into()
+	}
+}
+
+impl RewriterError {
+	pub fn not_str(x: &str, obj: &JsValue) -> Self {
+		Self::Not(format!("{:?} in {:?}", x, obj), "string")
+	}
+
+	pub fn not_fn(obj: JsValue) -> Self {
+		Self::Not(format!("{:?}", obj), "function")
+	}
+
+	pub fn not_bool(obj: &JsValue) -> Self {
+		Self::Not(format!("{:?}", obj), "bool")
+	}
+}
+
+pub type Result<T> = std::result::Result<T, RewriterError>;