## Update Zone Precursor Config

`client.precursor.update(PrecursorUpdateParamsparams, RequestOptionsoptions?): PrecursorConfig`

**put** `/zones/{zone_id}/precursor`

Updates the Precursor configuration for a zone.

`default_mode` sets the zone-level enforcement mode. `enforcement_rules`
is the ordered list of rules that override enforcement for matching
requests.

This is a partial update: only the fields present in the request body
are changed.

- Sending an empty array (`[]`) clears all enforcement rules.
- At least one of `default_mode` or `enforcement_rules` must be present;
  an empty body (`{}`) is rejected with `400`.
- Rule `id` is read-only (assigned by Cloudflare) and ignored on input.
- Rule `mode` must be `min-friction` or `max-security` (`off` is not a
  valid rule mode; use `default_mode` to disable enforcement).

### Parameters

- `params: PrecursorUpdateParams`

  - `zone_id: string`

    Path param: Identifier.

  - `default_mode?: "off" | "min-friction" | "max-security"`

    Body param: The zone-level Precursor enforcement mode applied to requests that do
    not match a more specific enforcement rule.

    - `"off"`

    - `"min-friction"`

    - `"max-security"`

  - `enforcement_rules?: Array<EnforcementRule>`

    Body param: The ordered list of enforcement rules for the zone.

    - `expression: string`

      The filter expression that determines which requests the rule matches.

    - `mode: "min-friction" | "max-security"`

      The override mode Precursor applies to requests matching an enforcement
      rule. Unlike `default_mode`, this cannot be `off`.

      - `"min-friction"`

      - `"max-security"`

    - `id?: string`

      The read-only identifier that Cloudflare assigns to the rule.

    - `description?: string`

      An informative description of the rule.

    - `enabled?: boolean`

      Whether the rule is active.

### Returns

- `PrecursorConfig`

  - `default_mode?: "off" | "min-friction" | "max-security"`

    The zone-level Precursor enforcement mode applied to requests that do
    not match a more specific enforcement rule.

    - `"off"`

    - `"min-friction"`

    - `"max-security"`

  - `enforcement_rules?: Array<EnforcementRule>`

    The ordered list of enforcement rules for the zone.

    - `expression: string`

      The filter expression that determines which requests the rule matches.

    - `mode: "min-friction" | "max-security"`

      The override mode Precursor applies to requests matching an enforcement
      rule. Unlike `default_mode`, this cannot be `off`.

      - `"min-friction"`

      - `"max-security"`

    - `id?: string`

      The read-only identifier that Cloudflare assigns to the rule.

    - `description?: string`

      An informative description of the rule.

    - `enabled?: boolean`

      Whether the rule is active.

### Example

```typescript
import Cloudflare from 'cloudflare';

const client = new Cloudflare({
  apiToken: process.env['CLOUDFLARE_API_TOKEN'], // This is the default and can be omitted
});

const precursorConfig = await client.precursor.update({
  zone_id: '023e105f4ecef8ad9ca31a8372d0c353',
  default_mode: 'min-friction',
});

console.log(precursorConfig.default_mode);
```

#### Response

```json
{
  "errors": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "messages": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "success": true,
  "result": {
    "default_mode": "min-friction",
    "enforcement_rules": [
      {
        "expression": "http.request.uri.path eq \"/shop\"",
        "mode": "max-security",
        "id": "3a03d665bac043e3a684e0d385a4b1e2",
        "description": "Enforce max-security on the shop page",
        "enabled": true
      }
    ]
  }
}
```