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diff --git a/src/lsp/providers/diagnosticsProvider.ts b/src/lsp/providers/diagnosticsProvider.ts
new file mode 100644
index 0000000000000000000000000000000000000000..51565e9c5cb5a4d1f3291a37a4c28d99a220d47d
--- /dev/null
+++ b/src/lsp/providers/diagnosticsProvider.ts
@@ -0,0 +1,79 @@
+import {
+ TextDocument,
+ Diagnostic,
+ DiagnosticSeverity,
+} from 'vscode-languageserver'
+import { State } from '../util/state'
+import { isCssDoc } from '../util/css'
+import { findClassNamesInRange } from '../util/find'
+import { getClassNameParts } from '../util/getClassNameAtPosition'
+const dlv = require('dlv')
+
+function provideCssDiagnostics(state: State, document: TextDocument): void {
+ const classNames = findClassNamesInRange(document)
+
+ let diagnostics: Diagnostic[] = classNames
+ .map(({ className, range }) => {
+ const parts = getClassNameParts(state, className)
+ if (!parts) return null
+ const info = dlv(state.classNames.classNames, parts)
+ let message: string
+ if (info.__context && info.__context.length > 0) {
+ if (info.__context.length === 1) {
+ message = `\`@apply\` cannot be used with \`.${className}\` because it is nested inside of an at-rule (${info.__context[0]}).`
+ } else {
+ message = `\`@apply\` cannot be used with \`.${className}\` because it is nested inside of at-rules (${info.__context.join(
+ ', '
+ )}).`
+ }
+ } else if (info.__pseudo && info.__pseudo.length > 0) {
+ if (info.__pseudo.length === 1) {
+ message = `\`@apply\` cannot be used with \`.${className}\` because its definition includes a pseudo-selector (${info.__pseudo[0]})`
+ } else {
+ message = `\`@apply\` cannot be used with \`.${className}\` because its definition includes pseudo-selectors (${info.__pseudo.join(
+ ', '
+ )})`
+ }
+ }
+
+ if (!message) return null
+
+ return {
+ severity: DiagnosticSeverity.Error,
+ range,
+ message,
+ // source: 'ex',
+ }
+ })
+ .filter(Boolean)
+
+ // if (state.editor.capabilities.diagnosticRelatedInformation) {
+ // diagnostic.relatedInformation = [
+ // {
+ // location: {
+ // uri: document.uri,
+ // range: Object.assign({}, diagnostic.range),
+ // },
+ // message: '',
+ // },
+ // {
+ // location: {
+ // uri: document.uri,
+ // range: Object.assign({}, diagnostic.range),
+ // },
+ // message: '',
+ // },
+ // ]
+ // }
+
+ state.editor.connection.sendDiagnostics({ uri: document.uri, diagnostics })
+}
+
+export async function provideDiagnostics(
+ state: State,
+ document: TextDocument
+): Promise<void> {
+ if (isCssDoc(state, document)) {
+ return provideCssDiagnostics(state, document)
+ }
+}
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