diff --git a/cli/csv-runner.ts b/cli/csv-runner.ts
index eabe33f..4f6a07c 100644
--- a/cli/csv-runner.ts
+++ b/cli/csv-runner.ts
@@ -33,16 +33,18 @@ export async function runCsvPipeline(
 
 	return runPipeline<CsvContext>(pending, {
 		...opts,
-		commitSuccess: opts.noSkipMarker ? async ({ lineIndex }) => {
-			const skip = await markSkipped(doc, lineIndex);
-			if (skip.ok) {
-				doc = skip.value;
-			} else {
-				console.error(
-					`  ${symbols.warn} failed to mark line ${dim(`${lineIndex}`)} as skipped: ${dim(describe(skip.error))}`,
-				);
+		commitSuccess: opts.noSkipMarker
+			? async ({ lineIndex }) => {
+				const skip = await markSkipped(doc, lineIndex);
+				if (skip.ok) {
+					doc = skip.value;
+				} else {
+					console.error(
+						`  ${symbols.warn} failed to mark line ${dim(`${lineIndex}`)} as skipped: ${dim(describe(skip.error))}`,
+					);
+				}
+				return skip;
 			}
-			return skip;
-		} : void 0,
+			: void 0,
 	});
 }
diff --git a/commands/import.ts b/commands/import.ts
index b21e8c0..35894fa 100644
--- a/commands/import.ts
+++ b/commands/import.ts
@@ -27,11 +27,11 @@ export async function executeImportCommand(args: string[] = Deno.args): Promise<
 		alias: {
 			n: "dry-run",
 			h: "help",
-			s: "no-skip-marker"
+			s: "no-skip-marker",
 		},
 		default: {
 			"dry-run": false,
-			"no-skip-marker": false
+			"no-skip-marker": false,
 		},
 	});
 
@@ -54,7 +54,7 @@ export async function executeImportCommand(args: string[] = Deno.args): Promise<
 	const opts: PipelineOptions = {
 		config: session.value,
 		dryRun: flags["dry-run"],
-		noSkipMarker: flags["no-skip-marker"]
+		noSkipMarker: flags["no-skip-marker"],
 	};
 
 	try {
diff --git a/deno.lock b/deno.lock
index 6e4ec77..60d8aa7 100644
--- a/deno.lock
+++ b/deno.lock
@@ -1,6 +1,7 @@
 {
   "version": "5",
   "specifiers": {
+    "jsr:@std/assert@1.0.16": "1.0.16",
     "jsr:@std/assert@1.0.19": "1.0.19",
     "jsr:@std/cli@^1.0.29": "1.0.29",
     "jsr:@std/crypto@^1.1.0": "1.1.0",
@@ -11,6 +12,12 @@
     "jsr:@std/path@^1.1.4": "1.1.4"
   },
   "jsr": {
+    "@std/assert@1.0.16": {
+      "integrity": "6a7272ed1eaa77defe76e5ff63ca705d9c495077e2d5fd0126d2b53fc5bd6532",
+      "dependencies": [
+        "jsr:@std/internal@^1.0.12"
+      ]
+    },
     "@std/assert@1.0.19": {
       "integrity": "eaada96ee120cb980bc47e040f82814d786fe8162ecc53c91d8df60b8755991e",
       "dependencies": [
diff --git a/lib/errors.ts b/lib/errors.ts
index 4a047c9..7248add 100644
--- a/lib/errors.ts
+++ b/lib/errors.ts
@@ -80,7 +80,12 @@ export const Errors = {
 
 	config: (tag: ConfigErrorReason, message: string): ConfigError => ({ kind: "config", tag, message }),
 
-	csv: (tag: CsvErrorReason, message: string, path?: string | undefined): CsvError => ({ kind: "csv", tag, message, path }),
+	csv: (tag: CsvErrorReason, message: string, path?: string | undefined): CsvError => ({
+		kind: "csv",
+		tag,
+		message,
+		path,
+	}),
 
 	auth: (message: string): AuthError => ({ kind: "auth", message }),
 
diff --git a/lib/format/csv/codec.ts b/lib/format/csv/codec.ts
index 4d57755..e9f3112 100644
--- a/lib/format/csv/codec.ts
+++ b/lib/format/csv/codec.ts
@@ -1,9 +1,11 @@
 import { Errors } from "~/lib/errors.ts";
-import { CSV_HEADER, type DocumentTrack } from "~/lib/format/csv/mod.ts";
+import { columnFields, type DocumentTrack } from "~/lib/format/csv/mod.ts";
 import { Fail, Ok, Result } from "~/lib/result.ts";
 
 type ParseError = ReturnType<typeof Errors.csv>;
 
+type ColumnIndices = Record<(typeof columnFields)[number], number>;
+
 // https://www.rfc-editor.org/rfc/rfc4180.html
 export function split(line: string): string[] {
 	const fields: string[] = [];
@@ -54,7 +56,7 @@ export function parseTrack(
 	line: string,
 	lineIndex: number,
 	path: string,
-	header?: Record<string, number>,
+	header?: ColumnIndices,
 ): Result<DocumentTrack, ParseError> {
 	if (line === serializeHeader()) {
 		return Fail(Errors.csv("invalid_columns", "header row", path));
@@ -82,11 +84,11 @@ export function parseTrack(
 	}
 
 	return Ok({
-		artist: unescape(fields[header["artist"]]),
-		albumArtist: unescape(fields[header["album_artist"]] ?? ""),
-		album: unescape(fields[header["album"]] ?? ""),
-		title: unescape(fields[header["title"]]),
-		date: unescape(fields[header["date"]] ?? ""),
+		artist: unescape(fields[header.artist]),
+		albumArtist: unescape(fields[header.album_artist] ?? ""),
+		album: unescape(fields[header.album] ?? ""),
+		title: unescape(fields[header.title]),
+		date: unescape(fields[header.date] ?? ""),
 	});
 }
 
@@ -95,20 +97,21 @@ export function serializeTrack(track: DocumentTrack): string {
 }
 
 export function serializeHeader(): string {
-	return CSV_HEADER.join(",");
+	return columnFields.join(",");
 }
 
-export function getColumnIndices(line: string): Result<Record<string, number>, ParseError> {
+export function getColumnIndices(line: string): Result<ColumnIndices, ParseError> {
 	const fields = split(line);
 	const returns: Record<string, number> = {};
+
 	const requiredFields = ["artist", "title"];
 
-	CSV_HEADER.forEach((currentValue: string) => {
+	columnFields.forEach((val) => {
 		for (let i = 0; i < fields.length; i++) {
 			const field = fields[i];
 
-			if (currentValue === field) {
-				returns[currentValue] = i;
+			if (val === field) {
+				returns[val] = i;
 				break;
 			}
 		}
@@ -123,5 +126,5 @@ export function getColumnIndices(line: string): Result<Record<string, number>, P
 		}
 	}
 
-	return Ok(returns);
+	return Ok(returns as ColumnIndices);
 }
diff --git a/lib/format/csv/io.ts b/lib/format/csv/io.ts
index ef3cf2b..70d5416 100644
--- a/lib/format/csv/io.ts
+++ b/lib/format/csv/io.ts
@@ -19,11 +19,11 @@ export async function loadCsvDocument(path: string): Promise<Result<CsvDocument,
 	const data = raw.split("\n");
 
 	if (data.length == 0) {
-		return Fail(Errors.csv("parse_failed", "file is possibly blank or not properly formatted", path))
+		return Fail(Errors.csv("parse_failed", "file is possibly blank or not properly formatted", path));
 	}
 
 	const pending: CsvDocument["pending"][number][] = [];
-	const header = getColumnIndices(data[0])
+	const header = getColumnIndices(data[0]);
 	let skippedCount = 0;
 
 	for (let i = +header.ok; i < data.length; i++) {
@@ -35,7 +35,7 @@ export async function loadCsvDocument(path: string): Promise<Result<CsvDocument,
 			continue;
 		}
 
-		const parsed = parseTrack(line, i, path, header.ok ? header.value : undefined)
+		const parsed = parseTrack(line, i, path, header.ok ? header.value : undefined);
 		if (!parsed.ok) return parsed;
 
 		pending.push({ track: parsed.value, lineIndex: i });
diff --git a/lib/format/csv/mod.ts b/lib/format/csv/mod.ts
index 6243e19..8860934 100644
--- a/lib/format/csv/mod.ts
+++ b/lib/format/csv/mod.ts
@@ -8,7 +8,7 @@ export interface DocumentTrack {
 	readonly date: string;
 }
 
-export const CSV_HEADER: readonly string[] = ["artist", "album_artist", "album", "title", "date"] as const;
+export const columnFields = ["artist", "album_artist", "album", "title", "date"] as const;
 
 /**
  * immutable state representing a loaded csv document in memory