@elastic/esql-definitions

Shared definitions for the ES|QL and PromQL languages — commands, functions, operators, settings, and their metadata.

Install

npm install @elastic/esql-definitions

Usage

The main entry holds the hand-maintained name lists and the definition TypeScript types:

import { commandsNames, functionNames } from '@elastic/esql-definitions';
import type { FunctionDefinition } from '@elastic/esql-definitions';

The full definition metadata (synced from the elasticsearch repo) is exposed via subpath exports:

import { commandDefinitions } from '@elastic/esql-definitions/commands';
import { functionDefinitions } from '@elastic/esql-definitions/functions';
import { operatorDefinitions } from '@elastic/esql-definitions/operators';
import { settingDefinitions } from '@elastic/esql-definitions/settings';
import { inlineCasts } from '@elastic/esql-definitions/inline-cast';
import { timeSeriesAggregates } from '@elastic/esql-definitions/time-series-aggregates';
import { promqlFunctionDefinitions } from '@elastic/esql-definitions/promql-functions';
import { promqlOperatorDefinitions } from '@elastic/esql-definitions/promql-operators';

timeSeriesAggregates maps each field type to the implicit aggregate ES|QL inserts for a bare column in a time-series STATS, and to the type the outer aggregate sees. counter_double becomes double, counter_integer becomes integer, counter_long becomes long, and text becomes keyword. The other entries (double, keyword, exponential_histogram, …) keep the same type.

timeSeriesAggregates.counter_double;
// { function: 'last_over_time', returnType: 'double' }

Documentation (descriptions, examples, notes, parameter docs) is split into parallel docs modules keyed by definition name:

import { functionDocs } from '@elastic/esql-definitions/function-docs';
import { operatorDocs } from '@elastic/esql-definitions/operator-docs';
import { promqlFunctionDocs } from '@elastic/esql-definitions/promql-function-docs';
import { promqlOperatorDocs } from '@elastic/esql-definitions/promql-operator-docs';

functionDocs.bucket.description;
functionDocs.bucket.params?.field; // ES|QL param docs live here, not in signatures

One asymmetry to know about: ES|QL parameter descriptions are identical across all signatures of a definition, so they live in docs.params keyed by parameter name. PromQL parameter descriptions vary per signature (e.g. lhs is "Instant vector." in one overload and "Scalar." in another).

How the definitions are synced

• elasticsearch/ — the machine-readable language definitions that Elasticsearch publishes for Kibana, copied verbatim from docs/reference/query-languages/{esql,promql}/kibana/generated/ in the elasticsearch repo by the grammar sync CI job (.buildkite/scripts/esql_grammar_sync.sh).
• src/generated/ — TypeScript modules generated from elasticsearch/ by scripts/generate.ts.

  pnpm --filter @elastic/esql-definitions generate

• src/definition_types.ts — hand-written TypeScript shapes of the raw JSON, used by the codegen script and exported from the main entry.

Note: the synced commands/ data does not cover all commands (e.g. FROM, ROW, JOIN variants are missing upstream), so the hand-maintained commandsNames and functionNames lists remain the source of truth for name lists.