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PingZing

•Created by PingZing on 12/17/2024 in #help-and-questions

Declaring a PrismaClient with conditional logging

Hi folks! I'm trying to instantiate a PrismaClient in a TypeScript project. I'm using v6.0.1, and have the following code:

export class DatabaseClient {
  private _prismaClient;

  constructor(databaseUrl: string, appInsightsClient?: appInsights.TelemetryClient) {
    const logDefinitions: Prisma.LogDefinition[] = [
      {
        level: "error",
        emit: "event",
      },
      {
        level: "warn",
        emit: "event",
      },
    ];

    this._prismaClient = new PrismaClient({
      datasourceUrl: databaseUrl,
      log: logDefinitions,
    });

    if (someCondition) {
      this._prismaClient.$on("error", (evt: Prisma.LogEvent) => {
        // Do som error logging stuff
      });
    }
  }

export class DatabaseClient {
  private _prismaClient;

  constructor(databaseUrl: string, appInsightsClient?: appInsights.TelemetryClient) {
    const logDefinitions: Prisma.LogDefinition[] = [
      {
        level: "error",
        emit: "event",
      },
      {
        level: "warn",
        emit: "event",
      },
    ];

    this._prismaClient = new PrismaClient({
      datasourceUrl: databaseUrl,
      log: logDefinitions,
    });

    if (someCondition) {
      this._prismaClient.$on("error", (evt: Prisma.LogEvent) => {
        // Do som error logging stuff
      });
    }
  }

Unfortunately, on the line where I set up the error logging, I get the following error: Argument of type '"error"' is not assignable to parameter of type 'never'. I can fix that if I declare my array of LogDefinitions inline with the PrismaClient but I'd like to conditionally set up my log levels, which means I can't do everything inline. Is there a way around this?

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