@appsemble/node-utils/middleware/error.js

NodeJS utilities used by Appsemble internally.

export function errorMiddleware() {
    return async (ctx, next) => {
        try {
            await next();
        }
        catch (error) {
            ctx.response.type = 'json';
            if (ctx.status && ctx.body) {
                ctx.app.emit('event', error, ctx);
            }
            else if (error instanceof Error &&
                error.message === 'Fields "subject" and "body" must be a valid string') {
                ctx.response.status = 400;
                ctx.response.body = {
                    error: 'Bad Request',
                    message: 'Fields "subject" and "body" must be a valid string',
                    statusCode: 400,
                };
                ctx.app.emit('event', error, ctx);
            }
            else {
                throw error;
            }
        }
    };
}
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