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const typeRegex: RegExp = /^[$a-z]\w*(\.!?\w+)*$/;
const paramsRegex: RegExp = /\{([^}]*)\}/g;
const interpolate = (string: string, params: Record<string, string> = {}): string => {
return string.replace(paramsRegex, (placeholder, label) => {
return typeof params[label] === 'undefined' ? `?${label}?` : params[label];
});
};
const getWarnHandler = ({
logFactory,
logLevel,
}: {
logFactory?: IApi;
logLevel: Parameters<ILog['logger']>[0];
}): ((msg: string | undefined, context: {method: string; args: unknown}) => void) => {
if (logFactory) {
const log = logFactory.createLog(logLevel, {name: 'utError', context: 'utError'});
if (log.warn) {
return (msg, context) => {
const e = new Error();
log.warn?.(
{
$meta: {
mtid: 'deprecation',
method: context.method,
},
args: context.args,
error: {
type: 'utError.deprecation',
stack: e.stack?.split('\n').splice(3).join('\n'),
},
},
msg,
);
};
}
}
return () => {};
};
export default ({
logFactory,
logLevel,
errorPrint,
}: {
logFactory?: IApi;
logLevel: Parameters<ILog['logger']>[0];
errorPrint?: string | boolean;
}): IErrorFactory => {
const warn = getWarnHandler({logFactory, logLevel});
const errors: Record<string | symbol, {message: string; print?: string} | string> = {
source: '',
};
// Mapping from lowercase no-dot keys to original error keys for case-insensitive lookup
const errorLookup: Record<string, string> = {};
// Create the proxy once upfront for reuse
const errorsProxy = new Proxy(errors, {
get(target, prop: string | symbol) {
if (typeof prop === 'symbol') return target[prop];
// First try direct access (backwards compatibility with dot notation)
if (prop in target) return target[prop];
// Convert property to lowercase without dots for lookup
let lookupKey = prop.toLowerCase();
// Remove 'error' prefix if present (e.g., errorReleaseJobTrigger -> releasjobtrigger)
if (lookupKey.startsWith('error')) {
lookupKey = lookupKey.substring(5);
}
// Try to find matching error
const originalKey = errorLookup[lookupKey];
if (originalKey && target[originalKey]) {
return target[originalKey];
}
// Throw error for non-existent properties to catch typos during destructuring
const availableErrors = Object.keys(target).sort().join(', ');
throw new Error(
`Error '${String(prop)}' not found. Available errors: ${availableErrors}`,
);
},
has(target, prop: string | symbol) {
if (typeof prop === 'symbol') return prop in target;
// Check direct access first
if (prop in target) return true;
// Check via lookup
let lookupKey = prop.toLowerCase();
if (lookupKey.startsWith('error')) {
lookupKey = lookupKey.substring(5);
}
return lookupKey in errorLookup;
},
ownKeys(target) {
// Return all original keys plus generated error* keys
const keys = Object.keys(target);
const additionalKeys = keys.map(key => {
// Convert 'release.jobTrigger' to 'errorReleaseJobTrigger'
const parts = key.split('.');
const camelCased = parts
.map((part, idx) =>
idx === 0 ? part : part.charAt(0).toUpperCase() + part.slice(1),
)
.join('');
return 'error' + camelCased.charAt(0).toUpperCase() + camelCased.slice(1);
});
return [...keys, ...additionalKeys];
},
getOwnPropertyDescriptor(target, prop: string | symbol) {
if (typeof prop === 'symbol') {
return Object.getOwnPropertyDescriptor(target, prop);
}
// Check both direct and via lookup
if (prop in target || this.has!(target, prop)) {
return {
enumerable: true,
configurable: true,
};
}
return undefined;
},
});
const api = {
get(type: string) {
return type ? errors[type] : errorsProxy;
},
fetch(type: string) {
const result = {} as Record<string, string | {message: string; print?: string}>;
Object.keys(errors).forEach(key => {
if (key.startsWith(type)) {
result[key] = errors[key];
}
});
return result;
},
define(id: string, superType: string | {type: string}, message: string) {
const type = [
superType ? (typeof superType === 'string' ? superType : superType.type) : null,
id,
]
.filter(x => x)
.join('.');
return api.register({[type]: message})[type];
},
register<T extends Record<string, string | {message: string; print?: string}>>(
errorsMap: T,
): Record<keyof T, (params?: unknown, $meta?: IMeta) => ITypedError> {
const result = {} as Record<keyof T, (params?: unknown, $meta?: IMeta) => ITypedError>;
Object.entries(errorsMap).forEach(([type, message]) => {
if (!typeRegex.test(type)) {
warn?.(`Invalid error type format: '${type}'!`, {
args: {type, expectedFormat: typeRegex.toString()},
method: 'utError.register',
});
}
const props: {message: string; print?: string} =
typeof message === 'string'
? {message, print: undefined}
: Array.isArray(message)
? {message: message[0], print: message[1]}
: message;
if (!props.message) throw new Error(`Missing message for error '${type}'`);
const error = errors[type] as {message?: string; print?: string} | undefined;
if (error) {
if (error.message !== props.message) {
throw new Error(
`Error '${type}' is already defined with different message!`,
);
}
(result as Record<string, (params?: unknown, $meta?: IMeta) => ITypedError>)[
type
] = error as unknown as (params?: unknown, $meta?: IMeta) => ITypedError;
return;
}
if (!props.print && errorPrint)
props.print = typeof errorPrint === 'string' ? errorPrint : props.message;
const handler = (
params = {params: undefined},
$meta: unknown,
): ITypedError | ITypedError[] => {
const error = new Error() as ITypedError;
if (params instanceof Error) {
error.cause = params;
} else {
Object.assign(error, params);
}
Object.assign(error, props);
Object.defineProperty(error, 'name', {
value: type,
configurable: true,
enumerable: false,
});
error.type = type;
if (props.print) error.print = props.print;
error.message = interpolate(props.message, params.params);
return $meta ? [error] : error; // to do - fix once bus.register allows to configure unpack
};
handler.type = type;
handler.message = props.message;
if (props.print) handler.print = props.print;
handler.params = handler.message
.match(paramsRegex)
?.map(param => param.substring(1, param.length - 1));
(result as Record<string, unknown>)[type] = (errors as Record<string, unknown>)[
type
] = handler;
// Add to lookup map (lowercase, no dots)
const lookupKey = type.toLowerCase().replace(/\./g, '');
errorLookup[lookupKey] = type;
});
return result;
},
};
return api as IErrorFactory;
};
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