Setup exceptions structure

src/exceptions/base.ts

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+import { Code } from './types';
+
+export class BaseException extends Error {
+	status: number;
+	code: Code;
+
+	constructor(message: string, status: number, code: Code) {
+		super(message);
+		this.status = status;
+		this.code = code;
+	}
+}

src/exceptions/index.ts

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+export * from './not-found';
+export * from './base';
+export * from './invalid-query';

src/exceptions/invalid-query.ts

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+import { BaseException } from './base';
+
+export class InvalidQueryException extends BaseException {
+	constructor(message: string) {
+		super(message, 400, 'INVALID_QUERY');
+	}
+}

src/exceptions/not-found.ts

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+import { BaseException } from './base';
+
+export class RouteNotFound extends BaseException {
+	constructor(path: string) {
+		super(`Route ${path} doesn't exist.`, 404, 'ROUTE_NOT_FOUND');
+	}
+}
+
+export class CollectionNotFoundException extends BaseException {
+	constructor(collection: string) {
+		super(`Collection ${collection} can't be found.`, 404, 'COLLECTION_NOT_FOUND');
+	}
+}
+
+export class FieldNotFoundException extends BaseException {
+	constructor(field: string) {
+		super(`Field ${field} can't be found.`, 404, 'FIELD_NOT_FOUND');
+	}
+}

src/exceptions/types.ts

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+export type Code =
+	| 'COLLECTION_NOT_FOUND'
+	| 'FIELD_NOT_FOUND'
+	| 'ROUTE_NOT_FOUND'
+	| 'NOT_FOUND'
+	| 'INVALID_QUERY';