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x/aleph/framework/core/error.ts

The Full-stack Framework in Deno.
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import { VERSION } from "../../version.ts";
export class FetchError extends Error { public status: number; public details: Record<string, unknown>;
constructor( status: number, message: string, details?: Record<string, unknown>, opts?: ErrorOptions, ) { super(message, opts); this.status = status; this.details = details ?? {}; }
static async fromResponse(res: Response): Promise<FetchError> { let status = res.status; let message = await res.text(); const details: Record<string, unknown> = {}; if (message.startsWith("{") && message.endsWith("}")) { try { const data = JSON.parse(message); const { status: maybeStatus, message: maybeMessage, details: maybeDetail, ...rest } = data; if (typeof maybeStatus === "number") { status = maybeStatus; } if (typeof maybeMessage === "string") { message = maybeMessage; } if (maybeDetail !== null && typeof maybeDetail === "object" && !Array.isArray(maybeDetail)) { Object.assign(details, maybeDetail); } Object.assign(details, rest); } catch (_e) { // ignore } } return new FetchError(status, message, details); }}
export class TransformError { specifier: string; sourceCode: string; message: string; stack: string; constructor(specifier: string, sourceCode: string, message: string, stack: string) { this.specifier = specifier; this.sourceCode = sourceCode; this.message = message; this.stack = stack; }}
const style = `.aleph--error-modal { display: flex; flex-direction: column; align-items: center; justify-content: center; position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; background: #fff; font-family: Inter,system-ui,-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif,'Apple Color Emoji','Segoe UI Emoji';}.aleph--error-modal .box { box-sizing: border-box; position: relative; max-width: 80%; max-height: 90%; overflow: auto; padding: 24px 30px; border-radius: 12px; border: 2px solid rgba(255, 0, 0, 0.8);}.aleph--error-modal pre { margin: 0; position: relative; line-height: 1.4;}.aleph--error-modal pre.source { margin: 8px 0; padding: 12px 0; line-height: 1.2; background: #f6f6f6;}.aleph--error-modal code { font-family: ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace; font-size: 14px; color: rgba(255, 0, 0, 1);}.aleph--error-modal .actions { display: flex; align-items: center; gap: 6px; margin-top: 18px;}.aleph--error-modal .actions button { padding: 5px 10px; border: 1px solid #ddd; background-color: #fff; border-radius: 6px; font-size: 14px; line-height: 1.2; color: #333; cursor: pointer;}.aleph--error-modal .actions button:hover { border-color: #aaa; background-color: rgba(255,255,255,0.9);}.aleph--error-modal .actions span { font-size: 14px; line-height: 1; color: #454545;}.aleph--error-modal .help-links { margin: 0; margin-top: 21px; display: flex; align-items: center; gap: 8px; font-size: 14px; line-height: 1; color: #bbb; border-top: 1px solid #ddd; padding-top: 15px;}.aleph--error-modal .help-links strong { display: inline-flex; align-items: center; gap: 4px; font-weight: 500; color: #333;}.aleph--error-modal .help-links a { color: teal; text-decoration: none;}.aleph--error-modal .help-links a:hover { text-decoration: underline;}`;const helperLinks = `<div class="help-links"> <strong>Aleph.js ${VERSION}</strong> / <a href="https://alephjs.org/docs/error-handling" target="_blank">Documentation</a> &middot; <a href="https://github.com/alephjs/aleph.js/issues/new" target="_blank">Open Issue</a> &middot; <a href="https://discord.com/channels/775256646821085215/775259756041601044" target="_blank">Discord Help Channel</a></div>`;const regStackLoc = /(https?:\/\/localhost:\d+\/.+)(:\d+:\d+)/;
function formatMessage(message: string, type?: string) { return message.split("\n").map((line, i) => { const ret = line.match(regStackLoc); if (ret) { const url = new URL(ret[1]); line = line.replace(ret[0], `.${url.pathname}${ret[2]}`); } if (i === 0) { if (type) { return `<strong>${type} ${line}</strong>`; } return `<strong>${line}</strong>`; } return line; }).join("\n");}
function sourceSummary(sourceCode: string, line: number, column: number): string { let lines = sourceCode.replaceAll("<", "&lt;").replaceAll(">", "&gt;").split(/\r?\n/).map((val, index) => { return String(1 + index).padStart(4, " ") + " | " + val; }); const mark = " ".repeat(4) + " | " + " ".repeat(column) + "^"; lines = lines.slice(line - 3, line + 2); lines.splice(3, 0, mark); return lines.join("\n");}
export function generateErrorHtml(message: string, type?: string): string { return `<!DOCTYPE html><html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <title>${type ?? ""} Error - Aleph.js</title> <style> body { overflow: hidden; } ${style} </style> </head> <body> <div class="aleph--error-modal"> <div class="box"> <pre><code>${formatMessage(message, type)}</code></pre> <div class="actions"> <button onclick="location.reload()">Reload</button> <button onclick="navigator.clipboard.writeText(document.querySelector('code').innerText).then(()=>{const ss=document.querySelector('.actions > span').style;ss.display='inline';setTimeout(()=>ss.display='none',2000)})">Copy</button> <span style="display:none;">Copied!</span> </div> ${helperLinks} </div> </div> </body></html>`;}
export function showTransformError(err: TransformError) { const message = formatMessage(err.message); const stack = err.stack.split("\n").slice(1).filter((v) => !v.includes("wasm://wasm")).join("\n"); const location = err.message.split(`${err.specifier.replace("\\", "\\\\")}:`)[1]?.split("\n")[0]?.split(":") .map((s: string) => parseInt(s)); const source = sourceSummary(err.sourceCode, location[0], location[1]); const modalEl = document.createElement("div"); modalEl.setAttribute("data-specifier", err.specifier); modalEl.className = "aleph--error-modal transform-error"; modalEl.innerHTML = ` <div class="box"> <pre><code>${message}</code></pre> <pre class="source"><code>${source}</code></pre> <pre><code>${stack}</code></pre> ${helperLinks} </div> `; document.body.appendChild(modalEl);}
if (globalThis.document) { const styleEl = document.createElement("style"); styleEl.appendChild(document.createTextNode(style)); document.head.appendChild(styleEl);}