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// Color constants for terminal output
const Colors = {
RED: '\x1b[31m',
YELLOW: '\x1b[33m',
CYAN: '\x1b[36m',
GRAY: '\x1b[90m',
RESET: '\x1b[0m',
BOLD: '\x1b[1m'
};
// Check if terminal supports colors
const supportsColor = (): boolean => {
return (
!!(process.stdout?.isTTY && process.env.TERM !== 'dumb') ||
process.env.FORCE_COLOR === '1' ||
process.env.FORCE_COLOR === 'true'
);
};
// Color formatter utility
const useColors = supportsColor() && process.env.NO_COLOR !== '1';
const colorize = (text: string, color: string): string => {
return useColors ? `${color}${text}${Colors.RESET}` : text;
};
// Get relative path from current working directory
const getRelativeFromCwd = (filePath: string): string => {
return path.relative(process.cwd(), filePath);
};
// Formatting functions
export const formatCircularDependency = (
moduleIds: string[],
targetModule: string
): string => {
const fullChain = [...moduleIds, targetModule];
return `${colorize(colorize('Module dependency chain (circular reference found):', Colors.BOLD), Colors.RED)}\n${fullChain
.map((module, index) => {
const isLastModule = index === fullChain.length - 1;
const prefix =
index === 0
? '┌─ '
: index === fullChain.length - 1
? '└─ '
: '├─ ';
const displayPath = getRelativeFromCwd(module);
// Check if this module appears elsewhere in the chain (circular dependency)
const isCircularModule =
fullChain.filter((m) => m === module).length > 1;
const coloredFile = isCircularModule
? colorize(colorize(displayPath, Colors.BOLD), Colors.RED)
: colorize(displayPath, Colors.CYAN);
const suffix = isLastModule
? ` ${colorize('🔄 Creates circular reference', Colors.YELLOW)}`
: '';
return `${colorize(prefix, Colors.GRAY)}${coloredFile}${suffix}`;
})
.join('\n')}`;
};
export const formatModuleChain = (
moduleIds: string[],
targetModule: string,
originalError?: Error
): string => {
let result = '';
if (moduleIds.length === 0) {
const displayPath = getRelativeFromCwd(targetModule);
result = `${colorize('Failed to load:', Colors.CYAN)} ${colorize(displayPath, Colors.RED)}`;
} else {
const chain = [...moduleIds, targetModule];
result = `${colorize(colorize('Module loading path:', Colors.BOLD), Colors.CYAN)}\n${chain
.map((module, index) => {
const indent = ' '.repeat(index);
const connector = index === 0 ? '' : '└─ ';
const displayPath = getRelativeFromCwd(module);
const isFailedFile = index === chain.length - 1;
const coloredFile = isFailedFile
? colorize(colorize(displayPath, Colors.BOLD), Colors.RED)
: colorize(displayPath, Colors.CYAN);
const status = isFailedFile
? ` ${colorize(colorize('❌ Loading failed', Colors.BOLD), Colors.RED)}`
: '';
return `${colorize(indent + connector, Colors.GRAY)}${coloredFile}${status}`;
})
.join('\n')}`;
}
if (originalError) {
result += `\n\n${colorize('Error details:', Colors.YELLOW)} ${originalError.message}`;
}
return result;
};
// Base module loading error class
export class ModuleLoadingError extends Error {
constructor(
message: string,
public moduleIds: string[],
public targetModule: string,
public originalError?: Error
) {
super(message);
this.name = 'ModuleLoadingError';
// Hide auxiliary properties from enumeration to avoid cluttering error display
Object.defineProperty(this, 'moduleIds', {
value: moduleIds,
writable: false,
enumerable: false,
configurable: true
});
Object.defineProperty(this, 'targetModule', {
value: targetModule,
writable: false,
enumerable: false,
configurable: true
});
if (originalError) {
Object.defineProperty(this, 'originalError', {
value: originalError,
writable: false,
enumerable: false,
configurable: true
});
}
}
}
// Circular dependency error class
export class CircularDependencyError extends ModuleLoadingError {
constructor(message: string, moduleIds: string[], targetModule: string) {
super(message, moduleIds, targetModule);
this.name = 'CircularDependencyError';
// Custom stack for clean error display
this.stack = `${this.name}: ${message}\n\n${formatCircularDependency(moduleIds, targetModule)}`;
}
}
// File read error class
export class FileReadError extends ModuleLoadingError {
constructor(
message: string,
moduleIds: string[],
targetModule: string,
originalError?: Error
) {
super(message, moduleIds, targetModule, originalError);
this.name = 'FileReadError';
// Custom stack for clean error display
this.stack = `${this.name}: ${message}\n\n${formatModuleChain(moduleIds, targetModule, originalError)}`;
}
}
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