Fixing how 'precision' adjusts the exponent if there's digits (#202)

Author: avoidwork

dist/filesize.cjs

@@ -167,6 +167,11 @@ function filesize (arg, {
 	// Zero is now a special case because bytes divide by 1
 	if (num === 0) {
 		result[0] = 0;
+
+		if (precision > 0) {
+			result[0] = result[0].toPrecision(precision);
+		}
+
 		u = result[1] = STRINGS.symbol[standard][bits ? BITS : BYTES][e];
 	} else {
 		val = num / (base === 2 ? Math.pow(2, e * 10) : Math.pow(1000, e));
@@ -188,6 +193,17 @@ function filesize (arg, {
 			e++;
 		}
 
+		// Setting optional precision
+		if (precision > 0) {
+			result[0] = result[0].toPrecision(precision);
+			const [ newResult, newExponent ] = result[0].split(E);
+			result[0] = newResult;
+
+			if (newExponent !== undefined) {
+				e += parseInt(newExponent, 10);
+			}
+		}
+
 		u = result[1] = base === 10 && e === 1 ? bits ? SI_KBIT : SI_KBYTE : STRINGS.symbol[standard][bits ? BITS : BYTES][e];
 	}
 
@@ -196,12 +212,6 @@ function filesize (arg, {
 		result[0] = -result[0];
 	}
 
-	// Setting optional precision
-	if (precision > 0) {
-		result[0] = result[0].toPrecision(precision);
-		result[0] = result[0].split(E)[0];
-	}
-
 	// Applying custom symbol
 	result[1] = symbols[result[1]] || result[1];
 

dist/filesize.js

@@ -163,6 +163,11 @@ function filesize (arg, {
 	// Zero is now a special case because bytes divide by 1
 	if (num === 0) {
 		result[0] = 0;
+
+		if (precision > 0) {
+			result[0] = result[0].toPrecision(precision);
+		}
+
 		u = result[1] = STRINGS.symbol[standard][bits ? BITS : BYTES][e];
 	} else {
 		val = num / (base === 2 ? Math.pow(2, e * 10) : Math.pow(1000, e));
@@ -184,6 +189,17 @@ function filesize (arg, {
 			e++;
 		}
 
+		// Setting optional precision
+		if (precision > 0) {
+			result[0] = result[0].toPrecision(precision);
+			const [ newResult, newExponent ] = result[0].split(E);
+			result[0] = newResult;
+
+			if (newExponent !== undefined) {
+				e += parseInt(newExponent, 10);
+			}
+		}
+
 		u = result[1] = base === 10 && e === 1 ? bits ? SI_KBIT : SI_KBYTE : STRINGS.symbol[standard][bits ? BITS : BYTES][e];
 	}
 
@@ -192,12 +208,6 @@ function filesize (arg, {
 		result[0] = -result[0];
 	}
 
-	// Setting optional precision
-	if (precision > 0) {
-		result[0] = result[0].toPrecision(precision);
-		result[0] = result[0].split(E)[0];
-	}
-
 	// Applying custom symbol
 	result[1] = symbols[result[1]] || result[1];