@bemedev/x-matches
v0.0.3
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Better way to macth states in XState
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Better way to macth states in XState
Short introduction to Xstate
XState is a implementation of Statecharts, a graphical way to represent complexity in code. Every you need to know is inside the docs.
Problems
- [x] Orthogonal/parallel state
To matches a parallel state, you need to put as parameter an entire object. Generally, you only need to know if the state is inside a child or a grandchild of the current state. XState is recursive, so for a small check, you can write a deep recursive object as parameter with infinite nested children.
- [x] Compound state
It’s the same problem as orthogonal but with less complexity. Here, I want to emphasize the problem of nested objects. Sometimes you only need to know if the state is inside the parent and you don’t care about the children. But in the current configuration of state.matches, you need to put as parameter and the nested current children.
- [ ] Direct implementation polyfill for core XState
Not yet implemented
The solution
A function to match with string representation of the current state or parent, or grandparent 😌😵💫, or… You see where I want to go!
I listed the cases inside this code block :
import buildMatches from '@bemedev/x-matches';
// Case 1 -> simple state
const simpleMatch = buildMatches('idle');
// Case 2 -> compound state
const compoundMatch = buildMatches({
fetching: {
parent: 'child',
},
});
// Case 3 -> parallel state
const parallelMatch = buildMatches({
auth: {
/* ... */
},
fetching: {
/* ... */
},
});
// The resulting function accepts a param array :
parallelMacth('auth', 'fetching');
compoundMatch('fetching', 'fetching.parent', 'fetching.parent.child');
Add-ons
We add possibilities to do logical "or" and logical "and"
Code example:
import buildMatches from '@bemedev/x-matches';
// Case 3 -> parallel state
const matches = buildMatches({
auth: 'notAuthenticated',
fetching: {
cache: 'nodata',
backend: 'data',
},
});
matches({ or: ['auth', 'fetching.cache.data'] }); // => true
matches({
and: ['auth.notAuthenticated', 'fetching.cache.data'],
}); // => false
matches(
{
and: ['auth.notAuthenticated', 'fetching.cache.data'],
},
'auth',
); // => false
matches(
{
or: ['auth', 'fetching.cache.data'],
},
'fetching',
); // => true
matches({
and: [
{
or: ['auth', 'fetching.cache.data'],
},
'fetching',
],
}); // => true
NB : The param array acts like a logical "and"
Live documentation here
Enjoy your function ✌🏾😎 !