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docs: mark optional properties/arguments explicitly with "?" (#13369 )

Previously, we were guessing whether something is optional from the
comment (looking for stuff like "defaults to" or "optional").

To remove this error-prone technique, every optional property or
argument (but not option) is explicitly marked with "?".

2022-04-06 19:02:10 -07:00

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class: Logger

langs: js

Playwright generates a lot of logs and they are accessible via the pluggable logger sink.

const { chromium } = require('playwright');  // Or 'firefox' or 'webkit'.

(async () => {
  const browser = await chromium.launch({
    logger: {
      isEnabled: (name, severity) => name === 'browser',
      log: (name, severity, message, args) => console.log(`${name} ${message}`)
    }
  });
  ...
})();

method: Logger.isEnabled

returns: <[boolean]>

Determines whether sink is interested in the logger with the given name and severity.

param: Logger.isEnabled.name

name <[string]>

logger name

param: Logger.isEnabled.severity

severity <[LogSeverity]<"verbose"|"info"|"warning"|"error">>

method: Logger.log

param: Logger.log.name

name <[string]>

logger name

param: Logger.log.severity

severity <[LogSeverity]<"verbose"|"info"|"warning"|"error">>

param: Logger.log.message

message <[string]|[Error]>

log message format

param: Logger.log.args

args <[Array]<[Object]>>

message arguments

param: Logger.log.hints

hints <[Object]>
- color ?<[string]> Optional preferred logger color.

optional formatting hints

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